Updates to README, fixes to filtering, optional arguments and expanded examples#1

Merged

miketung merged 3 commits intodiffbot:masterfrom

mattbanister:master

Feb 6, 2014

Commits on Feb 4, 2014

Fixed problem with filtering fields after API call. Fields are now sent in query string
mattbanister
committed
Updated README and added some more example calls
mattbanister
committed
Add kwargs parameter to Diffbot.request that can be used to pass optional parameters to API
mattbanister
committed