Fix move compilation errors in `find_and_track_build_and_update_status`

I had a bunch of compilation errors in this function because I wasn't
borrowing correctly. Fix the errors with borrows by reference, and
copying strings.

Here are the errors for reference:

    error[E0373]: closure may outlive the current function, but it borrows `job`, which is owned by the current function
      --> src/jenkins.rs:89:27
       |
    89 |             thread::spawn(|| {
       |                           ^^ may outlive borrowed value `job`
    ...
    94 |                     job.result.commit_status(),
       |                     --- `job` is borrowed here
       |
    help: to force the closure to take ownership of `job` (and any other referenced variables), use the `move` keyword
       |
    89 |             thread::spawn(move || {
       |                           ^^^^^^^

    error[E0373]: closure may outlive the current function, but it borrows `job_url`, which is owned by the current function
      --> src/jenkins.rs:89:27
       |
    89 |             thread::spawn(|| {
       |                           ^^ may outlive borrowed value `job_url`
    ...
    96 |                     job_url.clone(),
       |                     ------- `job_url` is borrowed here
       |
    help: to force the closure to take ownership of `job_url` (and any other referenced variables), use the `move` keyword
       |
    89 |             thread::spawn(move || {
       |                           ^^^^^^^

    error[E0382]: use of moved value: `commit_ref`
      --> src/jenkins.rs:88:32
       |
    88 |         if job_for_commit(job, commit_ref) {
       |                                ^^^^^^^^^^ value moved here in previous iteration of loop
       |
       = note: move occurs because `commit_ref` has type `pull_request::CommitRef`, which does not implement the `Copy` trait

    error[E0382]: capture of moved value: `commit_ref`
      --> src/jenkins.rs:93:21
       |
    88 |         if job_for_commit(job, commit_ref) {
       |                                ---------- value moved here
    ...
    93 |                     commit_ref,
       |                     ^^^^^^^^^^ value captured here after move
       |
       = note: move occurs because `commit_ref` has type `pull_request::CommitRef`, which does not implement the `Copy` trait

    error[E0382]: capture of moved value: `job`
      --> src/jenkins.rs:89:27
       |
    88 |         if job_for_commit(job, commit_ref) {
       |                           --- value moved here
    89 |             thread::spawn(|| {
       |                           ^^ value captured here after move
       |
       = note: move occurs because `job` has type `jenkins::Job`, which does not implement the `Copy` trait

    error[E0382]: capture of moved value: `job_url`
      --> src/jenkins.rs:89:27
       |
    85 |         let job = request_job(job_url);
       |                               ------- value moved here
    ...
    89 |             thread::spawn(|| {
       |                           ^^ value captured here after move
       |
       = note: move occurs because `job_url` has type `std::string::String`, which does not implement the `Copy` trait

3 files changed, 12 insertions, 12 deletions

diff --git a/src/af83.rs b/src/af83.rs
index bc8876c..1547700 100644
--- a/src/af83.rs
+++ b/src/af83.rs
@@ -1,6 +1,6 @@
 use pull_request::CommitRef;
 
-pub fn job_name(commit_ref: CommitRef) -> String {
+pub fn job_name(commit_ref: &CommitRef) -> String {
     let (sha, _) = commit_ref.sha.split_at(5);
 
     format!("{}-{}", commit_ref.branch, sha)
diff --git a/src/github.rs b/src/github.rs
index c5cedca..0eb85b0 100644
--- a/src/github.rs
+++ b/src/github.rs
@@ -33,8 +33,8 @@ impl fmt::Display for CommitStatus {
 }
 
 pub fn update_commit_status(
-    commit_ref: CommitRef,
-    state: CommitStatus,
+    commit_ref: &CommitRef,
+    state: &CommitStatus,
     target_url: String,
     description: Option<String>,
     context: String,
diff --git a/src/jenkins.rs b/src/jenkins.rs
index 0992983..2034492 100644
--- a/src/jenkins.rs
+++ b/src/jenkins.rs
@@ -82,17 +82,17 @@ pub fn find_and_track_build_and_update_status(
     let jobs = get_jobs(repo_name);
 
     for job_url in jobs {
-        let job = request_job(job_url);
+        let job = request_job(job_url.as_ref());
 
         // Does `displayName` match
-        if job_for_commit(job, commit_ref) {
-            thread::spawn(|| {
+        if job_for_commit(&job, &commit_ref) {
+            thread::spawn(move || {
                 // Start timer
 
                 github::update_commit_status(
-                    commit_ref,
-                    job.result.commit_status(),
-                    job_url,
+                    &commit_ref,
+                    &job.result.commit_status(),
+                    job_url.clone(),
                     None,
                     "continuous-integration/jenkins".to_string()
                 );
@@ -143,7 +143,7 @@ pub fn get_jobs(repo_name: String) -> Vec<String> {
         .collect::<Vec<String>>()
 }
 
-pub fn request_job(url: String) -> Job {
+pub fn request_job(url: &str) -> Job {
     let url = Url::parse(url.as_ref()).unwrap();
 
     let client = reqwest::Client::new();
@@ -166,8 +166,8 @@ pub fn request_job(url: String) -> Job {
 }
 
 // Does the `commit_ref` correspond to the job?
-pub fn job_for_commit(job: Job, commit_ref: CommitRef) -> bool {
-    job.display_name == af83::job_name(commit_ref)
+pub fn job_for_commit(job: &Job, commit_ref: &CommitRef) -> bool {
+    job.display_name == af83::job_name(&commit_ref)
 }
 
 pub fn result_from_job(status: Option<String>) -> JobStatus {