adding gitignore
Updated IOCextractor to use python-cybox v2.0.0. Removed cybox folder since the IOCextractor now utilizes python-cybox for CybOX generation. CybOX generation is optional.
Update README.md
Added check for python-cybox v2.0 or greater. Added work-around for CybOX v2.0 URI object schema bug, so the CybOX output is now schema valid
Merge pull request #17 from bworrell/master

Updated IOCextractor to leverage python-cybox v2.0.0