Common base class for plugins.
Add forgotten dependency lxml
Custom exceptions.
Tests for plugin base and wrapper for requests.get

* Wraps requests Exceptions
* Sets timeout from common setting
* Defaults verify=True
Caching, yay!
Use requests with a Session to allow cookie usage.
Initial (untested) version of iProva plugin.
Use settings over intershift_settings in plugin.
Fixup for iProva URL generation.
Structure for iProva tests.
Start the mockery!
iProva implementation tested but untested. ;)
Use session for suds traffic as well.
Move Requests defaults into session.