Move `Alias` to separate alias module

Take all of our Alias code, functions, errors, etc. and move them into
their own module. This removes some clutter from our `main.rs` file and
makes things better organised. Now all the alias code lives in its own
dedicated place.

Update our test file imports to match this change.

Updates to alias code:

* Reordered imports alphabetically
* Made `Alias` public
* Made `AliasSearchError` public
* Made all methods on `Alias` public

1 files changed, 1 insertions, 1 deletions

diff --git a/src/tests.rs b/src/tests.rs
index 21cf147..708121e 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -1,7 +1,7 @@
 use std::fs::{self, File, OpenOptions};
 use std::io::{Read, Write};
 
-use super::{Alias, AliasSearchError};
+use alias::{Alias, AliasSearchError};
 
 #[test]
 fn new_alias_with_only_email() {