Upgraded wiki_api to a MediaWikiAPI class, that is extendable.

* Note: setting parameters have been renamed, see settings.py.example
Created a WiktionaryAPI connecting the wiki api to the parser.

* The WiktionaryAPI extends the MediaWikiAPI class
* The WiktionaryAPI uses the WiktionaryParser class
* The WiktionaryAPI introduces new settings, see __init__
Added comments to the wiktionary_api module
Simplified TermForm check methods and processed pylint tips.
Merge remote-tracking branch 'origin/master'
Removed print debug statement