Add Brakeman::FindReturnValue
Add tests for scanning helper methods
Properly pass in env in FindReturnValue
FRV: Don't add empty returns
FRV: Don't return duplicate values
FRV: Handle if branches with nil return value
FRC: Try setting 'original_line' on values
Merge branch 'master' into simple_helper_scanning

Conflicts:
	test/apps/rails3.1/app/controllers/users_controller.rb
[WIP] Scan helper methods in controllers
Merge branch 'master' into simple_helper_scanning

Conflicts:
	test/apps/rails3.1/app/controllers/users_controller.rb
	test/apps/rails3.1/config/routes.rb
Merge branch 'master' into simple_helper_scanning

Conflicts:
	test/apps/rails3.1/app/controllers/users_controller.rb
Add initial tests for FindReturnValue
Move helper method scanning to AliasProcessor
Basic tests for scanning simple helper methods
Add ability to pull ivars from any env

not just current
Track ivar assignment in helper methods
Fix expected warnings in tests
Merge branch 'master' into simple_helper_scanning
Add test for to_sql interpolation false positive
Add `to_sql` as a safe method in SQL calls