Add 'error-chain' to the main library

Use 'error-chain' here too. Seems like this will be a pretty useful
library.

Change the include in the 'meetup' `lib.rs` to allow us to export
`meetup::Error` instead of `meetup::errors::Error` to be consistent with
the error types of the other third-party libraries we're using.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..d9e431b
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,6 @@
+error_chain! {
+    foreign_links {
+        Meetup(::meetup::Error);
+        Rss(::rss::Error);
+    }
+}