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.
Merge remote-tracking branch 'upstream/master' into william-dev

Conflicts:
	facebook.py
Implement add_users_to_custom_audience.