Update travis-core

Gemfile.lock

@@ -53,7 +53,7 @@ GIT
 
 GIT
   remote: git://github.com/travis-ci/travis-core.git
-  revision: e6bbe851c95e7afbbc5420661c8f1329d478a519
+  revision: 475973f29cd817bacec61db17a903730f4f07c51
   specs:
     travis-core (0.0.1)
       actionmailer (~> 3.2.12)
@@ -97,7 +97,6 @@ PATH
   specs:
     travis-api (0.0.1)
       backports (~> 2.5)
-      hubble (~> 0.1)
       newrelic_rpm (~> 3.6.1.88)
       pg (~> 0.13.2)
       rack-contrib (~> 1.1)
@@ -172,8 +171,6 @@ GEM
     hashr (0.0.22)
     hike (1.2.2)
     hitimes (1.2.1)
-    hubble (0.1.2)
-      yajl-ruby (~> 1.1)
     i18n (0.6.1)
     journey (1.0.4)
     json (1.8.0)
@@ -284,7 +281,6 @@ GEM
       polyglot (>= 0.3.1)
     tzinfo (0.3.37)
     uuidtools (2.1.4)
-    yajl-ruby (1.1.0)
     yard (0.8.6.1)
 
 PLATFORMS