Bump travis-core

Gemfile.lock

@@ -17,9 +17,9 @@ GIT
 
 GIT
   remote: git://github.com/rkh/gh.git
-  revision: 8f91386862f246c98057f4f628b5d7a420de6e7c
+  revision: 1dece05c588c63e714520aae686589de1b3bcbd5
   specs:
-    gh (0.9.0)
+    gh (0.9.1)
       addressable
       backports (~> 2.3)
       faraday (~> 0.8)
@@ -66,7 +66,7 @@ GIT
 
 GIT
   remote: git://github.com/travis-ci/travis-core.git
-  revision: cdd18fc7745ba17513b677ac3a508a7dbb1efede
+  revision: 2c50d6f9bf2407cab6f4fd14678dabcbbf919728
   specs:
     travis-core (0.0.1)
       actionmailer (~> 3.2.11)
@@ -210,7 +210,7 @@ GEM
     newrelic_rpm (3.3.5)
     pg (0.13.2)
     polyglot (0.3.3)
-    postmark (0.9.15)
+    postmark (0.9.18)
       json
       rake
     postmark-rails (0.4.1)
@@ -224,7 +224,7 @@ GEM
     pusher (0.11.2)
       multi_json (~> 1.0)
       signature (~> 0.1.6)
-    rack (1.4.3)
+    rack (1.4.4)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-protection (1.3.2)