Create Rails 4.2 staging branch

MSP-12847

* use Rails 4.2
* set PRERELASE to rails-4.2
* use github staging/rails-4.2 for metapsloit gems

Gemfile

@@ -11,13 +11,13 @@ group :development, :test do
   # auto-load factories from spec/factories
   gem 'factory_girl_rails'
   # Point to staging/rails-4.1 on github
-  gem 'metasploit-yard', github: 'rapid7/metasploit-yard', branch: 'staging/rails-4.1'
+  gem 'metasploit-yard', github: 'rapid7/metasploit-yard', branch: 'staging/rails-4.2'
 end
 
 group :test do
   # rails is not used because activerecord should not be included, but rails would normally coordinate the versions
   # between its dependencies, which is now handled by this constraint.
-  rails_version_constraint = ['~> 4.1.0']
+  rails_version_constraint = ['~> 4.2.0']
 
   # Dummy app uses actionpack for ActionController, but not rails since it doesn't use activerecord.
   gem 'actionpack', *rails_version_constraint

lib/metasploit/model/version.rb

@@ -13,7 +13,7 @@ module Version
       # The patch version number, scoped to the {MAJOR} and {MINOR} version numbers.
       PATCH = 0
       # The prerelease version, scoped to the {MAJOR}, {MINOR}, and {PATCH} version numbers.
-      PRERELEASE = 'rails-4.1'
+      PRERELEASE = 'rails-4.2'
       #
       # Module Methods
       #

metasploit-model.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'yard', '< 0.8.7.4'
 
   # Dependency loading
-  rails_version_constraints = ['~> 4.1.0']
+  rails_version_constraints = ['~> 4.2.0']
 
   spec.add_runtime_dependency 'activemodel', *rails_version_constraints
   spec.add_runtime_dependency 'activesupport', *rails_version_constraints