Auth fixes, tests.py, increment method, pep8

Fixed authentication, since Parse appears to have changed their API.

Added tests.py with unit tests for ParseObject and ParseQuery classes.

Added ParseObject.increment(key) method.

pep8 compliance changes, mostly removing end of line whitespace
Mention increment method in README and added test case for ParseObject.delete().
GeoPoint Support added

GeoPoints use string with format  POINT(lat lon)
added geoPoint documentation
markdown tweaks
Merge pull request #1 from billyto/master

geoPoints
Changes for pep8 compliance
Supporting relational queries
fix regex bug

regex wasn't parsing negative latitudes.
Update README.mkd

fliping POINT(latitude longitude) to POINT(longitude latitude)
flipping lat - lon on point creation.
merged dhruv's commit for relation queries: 418e9a5938d01e83679d6162dbdd8aab932620ea
added repr to base class
reverted back to MASTER_KEY for now.
removed repr