Remove unnecessary gems, bump rspec version to match GitLab CE

Gemfile

@@ -5,8 +5,7 @@ gemspec
 group :development do
   gem 'rubocop', '~> 0.43.0'
   gem 'rubocop-rspec', '~> 1.8.0'
-  gem 'rspec', '~> 3.0'
-  gem 'webmock'
+  gem 'rspec', '~> 3.5.0'
   gem 'pry'
   gem 'rake'
 end

gemfiles/rails_42.gemfile

@@ -7,8 +7,7 @@ gem "activesupport", "~> 4.2.7"
 group :development do
   gem "rubocop", '~> 0.43.0'
   gem "rubocop-rspec", '~> 1.8.0'
-  gem "rspec", "~> 3.0"
-  gem "webmock"
+  gem "rspec", "~> 3.5.0"
   gem "pry"
   gem "rake"
 end

gemfiles/rails_50.gemfile

@@ -7,8 +7,7 @@ gem "activesupport", "~> 5.0.0"
 group :development do
   gem "rubocop", '~> 0.43.0'
   gem "rubocop-rspec", '~> 1.8.0'
-  gem "rspec", "~> 3.0"
-  gem "webmock"
+  gem "rspec", "~> 3.5.0"
   gem "pry"
   gem "rake"
 end

gitlab_git.gemspec

@@ -15,5 +15,4 @@ Gem::Specification.new do |s|
   s.add_dependency("activesupport", ">= 4.0")
   s.add_dependency("rugged", "~> 0.24.0")
   s.add_dependency("charlock_holmes", "~> 0.7.3")
-  s.add_development_dependency("listen", "~> 3.0.6")
 end