Update coveralls from 0.8.9 to 0.8.13 and simplecov from 0.10.0 to 0.11.2

This removes a few dependencies! It was also rude to be using coveralls
0.8.9, considering 0.8.12 introduced support for GitLab CI :) Also
paves the way for updating mime-types to 3.0.

Coveralls Changelog:
https://github.com/lemurheavy/coveralls-ruby/releases

Simplecov Changelog:
https://github.com/colszowka/simplecov/blob/master/CHANGELOG.md

Gemfile

@@ -290,7 +290,7 @@ group :development, :test do
   gem 'rubocop', '~> 0.38.0', require: false
   gem 'scss_lint', '~> 0.47.0', require: false
   gem 'coveralls',  '~> 0.8.2', require: false
-  gem 'simplecov', '~> 0.10.0', require: false
+  gem 'simplecov', '~> 0.11.0', require: false
   gem 'flog', require: false
   gem 'flay', require: false
   gem 'bundler-audit', require: false

Gemfile.lock

@@ -136,10 +136,9 @@ GEM
     colorize (0.7.7)
     concurrent-ruby (1.0.0)
     connection_pool (2.2.0)
-    coveralls (0.8.9)
+    coveralls (0.8.13)
       json (~> 1.8)
-      rest-client (>= 1.6.8, < 2)
-      simplecov (~> 0.10.0)
+      simplecov (~> 0.11.0)
       term-ansicolor (~> 1.3)
       thor (~> 0.19.1)
       tins (~> 1.6.0)
@@ -176,8 +175,6 @@ GEM
     diff-lcs (1.2.5)
     diffy (3.0.7)
     docile (1.1.5)
-    domain_name (0.5.25)
-      unf (>= 0.0.5, < 1.0.0)
     doorkeeper (2.2.2)
       railties (>= 3.2)
     dropzonejs-rails (0.7.2)
@@ -421,8 +418,6 @@ GEM
       nokogiri (~> 1.6.0)
       ruby_parser (~> 3.5)
     htmlentities (4.3.4)
-    http-cookie (1.0.2)
-      domain_name (~> 0.5)
     http_parser.rb (0.5.3)
     httparty (0.13.7)
       json (~> 1.8)
@@ -480,7 +475,6 @@ GEM
     nested_form (0.3.2)
     net-ldap (0.12.1)
     net-ssh (3.0.1)
-    netrc (0.11.0)
     newrelic_rpm (3.14.1.311)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
@@ -657,10 +651,6 @@ GEM
       listen (~> 3.0)
     responders (2.1.1)
       railties (>= 4.2.0, < 5.1)
-    rest-client (1.8.0)
-      http-cookie (>= 1.0.2, < 2.0)
-      mime-types (>= 1.16, < 3.0)
-      netrc (~> 0.7)
     rinku (1.7.3)
     rotp (2.1.1)
     rouge (1.10.1)
@@ -754,7 +744,7 @@ GEM
       rufus-scheduler (>= 2.0.24)
       sidekiq (>= 4.0.0)
     simple_oauth (0.1.9)
-    simplecov (0.10.0)
+    simplecov (0.11.2)
       docile (~> 1.1.0)
       json (~> 1.8)
       simplecov-html (~> 0.10.0)
@@ -845,7 +835,7 @@ GEM
     underscore-rails (1.8.3)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.7.1)
+    unf_ext (0.0.7.2)
     unicode-display_width (1.0.2)
     unicorn (4.9.0)
       kgio (~> 2.6)
@@ -1032,7 +1022,7 @@ DEPENDENCIES
   shoulda-matchers (~> 2.8.0)
   sidekiq (~> 4.0)
   sidekiq-cron (~> 0.4.0)
-  simplecov (~> 0.10.0)
+  simplecov (~> 0.11.0)
   sinatra (~> 1.4.4)
   six (~> 0.2.0)
   slack-notifier (~> 1.2.0)