* Added Django environment folder in exclusion
Django projects have env/ folder in which dependencies of the project like Django, Pillow, and other libraries are installed from the requirements.txt file. It would be best if this folder of dependencies is ignored from the language statistics.
* Corrected Errors
Corrected the misplaced code and put removed the start character as the environment folder may not always be in the root.
* Adding test for env folder
This gives us a consistent test framework across all Ruby versions which
should help avoid errors that are only found when CI runs the tests on
different Rubies. (And this fixes an immediate bug where there's no
`skip` method in the version of test-unit we're currently using only on
Ruby 2.2.)
