Bump travis-core (secure env var changes)

Gemfile.lock

@@ -44,7 +44,7 @@ GIT
 
 GIT
   remote: git://github.com/travis-ci/travis-core.git
-  revision: 475973f29cd817bacec61db17a903730f4f07c51
+  revision: 828858bb78f104960663e267d07f0fc93d94fd0a
   specs:
     travis-core (0.0.1)
       actionmailer (~> 3.2.12)
@@ -60,7 +60,7 @@ GIT
       rake
       redis (~> 3.0)
       rollout (~> 1.1.0)
-      simple_states (~> 0.1.1)
+      simple_states (~> 1.0.0)
       thor (~> 0.14.6)
 
 GIT
@@ -160,7 +160,7 @@ GEM
       thor (>= 0.13.6)
     hashie (2.0.5)
     hashr (0.0.22)
-    hike (1.2.2)
+    hike (1.2.3)
     hitimes (1.2.1)
     i18n (0.6.1)
     journey (1.0.4)
@@ -181,7 +181,7 @@ GEM
     mime-types (1.23)
     mocha (0.14.0)
       metaclass (~> 0.0.1)
-    multi_json (1.7.3)
+    multi_json (1.7.6)
     multipart-post (1.2.0)
     net-http-persistent (2.8)
     net-http-pipeline (1.0.1)
@@ -243,7 +243,7 @@ GEM
       redis (~> 3)
       redis-namespace
     signature (0.1.7)
-    simple_states (0.1.1)
+    simple_states (1.0.0)
       activesupport
       hashr (~> 0.0.10)
     sinatra (1.3.6)
@@ -270,7 +270,7 @@ GEM
     thor (0.14.6)
     tilt (1.4.1)
     timers (1.1.0)
-    treetop (1.4.12)
+    treetop (1.4.14)
       polyglot
       polyglot (>= 0.3.1)
     tzinfo (0.3.37)