Upgraded diesel to 0.99 and switched from the git master into crated.io.

Also did a cargo upgrade of all the dependancies.
Notable upgrades are r2d2, lazystatic 1.0, loggerv 0.6 and rss 1.2

hammond-downloader/src/downloader.rs

@@ -185,7 +185,7 @@ mod tests {
     use hammond_data::Source;
     use hammond_data::feed::index;
     use hammond_data::dbqueries;
-    use diesel::Identifiable;
+    use diesel::associations::Identifiable;
 
     use std::fs;