Remove unused gem

Gemfile

@@ -97,7 +97,6 @@ group :test do
   gem 'poltergeist'
   gem 'coveralls', require: false
   gem 'email_spec'
-  gem 'http'
 end
 
 group :development do

Gemfile.lock

@@ -140,8 +140,6 @@ GEM
       railties (>= 3.2.6, < 5.0)
     diff-lcs (1.2.5)
     docile (1.1.5)
-    domain_name (0.5.20161021)
-      unf (>= 0.0.5, < 1.0.0)
     easy_translate (0.5.0)
       json
       thread
@@ -188,15 +186,6 @@ GEM
     hashie (3.4.6)
     highline (1.7.8)
     htmlentities (4.3.4)
-    http (2.1.0)
-      addressable (~> 2.3)
-      http-cookie (~> 1.0)
-      http-form_data (~> 1.0.1)
-      http_parser.rb (~> 0.6.0)
-    http-cookie (1.0.3)
-      domain_name (~> 0.5)
-    http-form_data (1.0.1)
-    http_parser.rb (0.6.0)
     httpi (2.4.1)
       rack
     i18n (0.7.0)
@@ -437,9 +426,6 @@ GEM
       thread_safe (~> 0.1)
     uglifier (3.0.4)
       execjs (>= 0.3.0, < 3)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.7.2)
     unicode-display_width (1.1.1)
     unicorn (5.1.0)
       kgio (~> 2.6)
@@ -500,7 +486,6 @@ DEPENDENCIES
   graphiql-rails
   graphql
   groupdate (~> 3.1.0)
-  http
   i18n-tasks
   initialjs-rails (= 0.2.0.4)
   invisible_captcha (~> 0.9.1)