Add helper to make testing of environment variables easier
Added missing test for with_env
More documentation added
Add some more documentation
Migrate contribution guide to separate file because github displays that file on PR
Add documentation on usage with frameworks other than cucumber
Added pros and cons of use of inprocess based on experience
Added year to copyright
Add explanation to dirs
Merge remote-tracking branch 'origin/master' into feature/documentation

Conflicts:
	CONTRIBUTING.md
Merge pull request #188 from dg-vrnetze/feature/with_env

Feature/with env
Make naming of test examples more consistent
Add helper to generate random string to make testing easier
Add file expand wherever needed
Added tests for checking ~ paths
Moved file tests in file describe block
Step to mock home directory
Fixed bug in After
Added tests for mocking the home directory
Reuse existing functionality in aruba