Revert "Relax ruby2ruby and ruby_parser dependencies"

This reverts commit 5f788264ba908b2df2b45e48c8e7644683306c59.
Fix CheckRender error with nested render calls

Fixes #484
Merge pull request #485 from presidentbeef/fix_process_render_error

Fix CheckRender error with nested render calls
Support chained model calls in RedirectCheck
Support Rails 4 model queries in CheckRedirect

as mentioned in #486
Update and clarify option documentation
Add markdown option to README
Fixed treatment of protected_attributes gem for Rails 4
Merge pull request #491 from phene/fix-rails4-mass-assignment-detection

Fixed treatment of protected_attributes gem for Rails 4
Merge pull request #489 from presidentbeef/add_more_rails_4_model_methods_in_redirect_check

Add more Rails 4 model methods in redirect check
Merge pull request #490 from presidentbeef/option_documentation_updates

Option documentation updates
First pass to make controller parsing stateful
map methods to filenames
Merge branch 'fix-one-to-one-assumption'

Process controllers defined in multiple files
bump ruby_parser to 3.5.0 to support ruby 2.1 syntax
Merge pull request #497 from github/bump-ruby_parser

bump ruby_parser to 3.5.0 to support ruby 2.1 syntax
Improve default route handling for Rails 3/4
Merge pull request #493 from jjarmoc

Improve route checking for HTTP verb routes.
support models found in multiple files
start tracking src for all parsed files