Remove spurious period.
Update CONTRIBUTING with link to docs.

This should increase the changes that new contributors actually read
this section before creating pull requests on Github.
Created flask example app

A barebones Flask application that uses Facebook and the Facebook for Python
SDK for login.
Merge @mylsb's Flask example app. Fix #143.
Add example script to retrieve timeline posts.

Thanks to @mylsb for agreeing to its inclusion as an example.

Since this includes an example of pagination, this is also relevant to
issue #85.
Merge documentation and example updates.