Update endpoints.py

Added endpoint for statuses/lookup (https://dev.twitter.com/docs/api/1.1/get/statuses/lookup).
Merge pull request #326 from bsbkeven/master

statuses/lookup function in endpoints.py
first pep8 work
more pep8 fixes
pep8 finished
Merge pull request #333 from greedo/pep8

PEP8
Merge pull request #323 from Hasimir/patch-5

Create block_spammer.py
Merge pull request #322 from Hasimir/patch-4

Create unblock_user.py
Merge pull request #321 from Hasimir/patch-1

Create block_user.py
Merge pull request #320 from Hasimir/patch-3

Create unfollow_user.py
Revert 1aa2d45..3bef603

This rolls back to commit 1aa2d451d9edc063122bfd7a88e5c104bed08017.
Merge branch 'master' of github:ryanmcgrath/twython

Conflicts:
	examples/block_spammer.py
	examples/block_user.py
	examples/unblock_user.py
	examples/unfollow_user.py