Improve testing, add new doc and bug fixing

Several new functions have been added to the core of Optimus, some were renamed for easy use. The issues solved by this release are:

#117 [Testing with airbrake]
#116 [Setup Airbrake for your Python application]
#109 [Wrapping o modifying the transformer.get_data_frame().show() function]

And the PR that have all the info and more changes is:

#115 [Fix testing for airbrake (and everything else for 1.0.1)].