Loading configuration now works with latest salt.

* Refactored salt-cloud's configuration loading to work with latest salt and applied the same juice @HonzaKral added to salt into salt-cloud. Refs #253.
* Added salt-cloud configuration includes support. Fixes #280.
* Implemented VM profiles includes support.
Some more keys need to be skipped.
Merge branch 'develop' of github.com:saltstack/salt-cloud into develop
Fix `NameError`.
Fix the parsers configuration loading/overriding. Refs #287.
Minor PEP8 fix.
Merge pull request #287 from s0undt3ch/develop

Loading configuration now works with latest salt.