Bump coveralls gem

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Gemfile.lock

@@ -3,15 +3,15 @@ GEM
   specs:
     addressable (2.3.2)
     coderay (1.0.8)
-    colorize (0.5.8)
-    coveralls (0.6.2)
-      colorize
+    coveralls (0.7.1)
       multi_json (~> 1.3)
       rest-client
       simplecov (>= 0.7)
+      term-ansicolor
       thor
     crack (0.3.1)
     diff-lcs (1.1.3)
+    docile (1.1.5)
     guard (1.5.4)
       listen (>= 0.4.2)
       lumberjack (>= 1.0.2)
@@ -23,14 +23,16 @@ GEM
     listen (0.5.3)
     lumberjack (1.0.2)
     method_source (0.8.1)
-    mime-types (1.21)
-    multi_json (1.6.1)
+    mime-types (2.3)
+    multi_json (1.10.1)
+    netrc (0.7.7)
     pry (0.9.10)
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.3.1)
-    rest-client (1.6.7)
-      mime-types (>= 1.16)
+    rest-client (1.7.2)
+      mime-types (>= 1.16, < 3.0)
+      netrc (~> 0.7)
     rspec (2.12.0)
       rspec-core (~> 2.12.0)
       rspec-expectations (~> 2.12.0)
@@ -39,12 +41,16 @@ GEM
     rspec-expectations (2.12.1)
       diff-lcs (~> 1.1.3)
     rspec-mocks (2.12.2)
-    simplecov (0.7.1)
+    simplecov (0.9.1)
+      docile (~> 1.1.0)
       multi_json (~> 1.0)
-      simplecov-html (~> 0.7.1)
-    simplecov-html (0.7.1)
+      simplecov-html (~> 0.8.0)
+    simplecov-html (0.8.0)
     slop (3.3.3)
-    thor (0.16.0)
+    term-ansicolor (1.3.0)
+      tins (~> 1.0)
+    thor (0.19.1)
+    tins (1.3.3)
     vcr (2.4.0)
     webmock (1.9.0)
       addressable (>= 2.2.7)