Update ruby_parser to the lastest version (3.1.1)

This fixes a conflict with the 'tomdoc' gem.
Add tests for more mass assignment methods
Add more mass assignment methods to check

fixes #223
Fix up mass assignment tests
Merge branch 'master' into more_mass_assignment_methods

Conflicts:
	test/tests/test_rails3.rb
presidentbeef/brakeman#210 Add hilarious pluralize method to remove activesupport
Remove active_support as well
Merge remote-tracking branch 'oreoshake/gh210_remove_active_support'

Remove active_support dependency, fixes #210
Merge remote-tracking branch 'neersighted/patch-1'

Update to RubyParser 3.1.1