Adding save and save_as command but there is a problem with view SaveAs method
Merge branch 'develop' into feature/save

* develop:
  Fixed atomic save problem, added tests for pre and post save events
  Documentation
  atomic save not working
Finished Save & SaveAs command
Merge branch 'develop' into feature/save

* develop:
  Fixed window.Views() bug
Completed save_all command
Watching the new save as files
Showing some info about the error
Merge pull request #278 from ZiDoMs/feature/save

Save commands
Fixes #222
Fixes #38
Fixes #87
backend: Add lookup tables for event names
backend: Query user whether to reload a file or not
backend/commands/save_test: make use of DummyFrontend.DefaultAction

Otherwise the files will be automatically reloaded in the background
travis: Possible fix for building PRs rather than master