Added support for conditionally disabling tests that require an active internet connection by setting the 'OFFLINETESTING' environment variable to anything else than an empty String.
Merge pull request #190 from ixorbe/support-for-offline-testing

Added support for conditionally disabling tests that require an active internet connection
Major changes in DiffGenerator. Updated safe/breaks/warning information.
Bug fixes in ElementsDiffGenerator for cycling dependencies. Thanks @ithena for the bug report and test data .
Merge branch 'master' into ixorbe-stable