Modiifed
Added a few tests; minor refactoring; began re-writing code documentation using reST markup for Sphinx autodoc generation
Renamed a few methods of the OWM class, changed docs accordingly; added more reST documentation to the code
General refactoring in exceptions usage: renamed existing ones into 'errors', added a new one and changed in jsonparser.py the parts of code that handle status errors in OWM HTTP responses
Updated internal docs; completed reST documentation of the code