update regex for get_version to match end of lines and add tests

tests for gem processor regexp get_version

revert namespacing in brakeman test oops

try new end of line regex match and refactor tests

update regexp and test to match \r\n or \n

add another test for matching short gem versions

make regexp match only dot seperated characters of any length
Merge pull request #370 from themetric/fix_get_version_gemfile

Fix get version gemfile regexp and add tests