create method "get_stats_for_adaccount"

Create a method to get FB stats for an entire ad account.  Also fixes an unrelated bug in querying some endpoints based on start/end times.
Removed commented-out lines

I removed a couple commented-out lines of code that I forgot to delete before submitting the original Pull Request.
Update facebook.py
Merge pull request #29 from bpmason1/patch-3

create method "get_stats_for_adaccount"
Bump up version for integrating code change.
Add get_adspixels method for getting remarketing pixel.
Add get_ads_pixels for getting remarketing pixels and add warning log in deprecated methods.
Merge pull request #35 from taenyon/update

Add get_ads_pixels for getting remarketing pixels and add warning log in deprecated methods.
Bump up version for adding a feature.
Allow creating the API without an app id and app secret, since most operations don't require them.
Clean up some deprecated audience code that deals with obsolete FB API.
Remove creative type_27 method, since it will no longer work on FB.
Delete "create_audience_from_website" since with the present API, it no longer does anything different than other audiences.
Add method for adding users to a custom audience, using the post-October 2014 API.
Merge branch 'add-users-to-audience'
Merge branch 'cleanup-deprecated'