Added some helpful info for contributors
Minor changes
APIs that return values (e.g. transactions()) were returning None before this fix
Added support for the /balance REST API
Added support for calling the API from Google App Engine where one has to use the urlfetch API to make an http/https call.
Complete the previous commit and added a GAE sample
Ignore the pycharm IDE files
Update client.py
Update test_client.py
Update test_client.py
Delete plaid
Update README.md
switch if/else per David's review comments
None is the default
trailing newline
Update http.py
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README.md
Merge pull request #1 from gae123/master

balance() API, fix for functions that return a value (e.g. transactions()) & support for Google App Engine