Remove '.' from requirements.txt since:
Remove '.' from requirements.txt since:

* It's taken care of in Makefile
* It's taken care of in gittip.py
* Uses '-e .' in those other places

gratipay/gratipay.com,mccolgst/www.gittip.com,mccolgst/www.gittip.com,studio666/gratipay.com,bountysource/www.gittip.com,eXcomm/gratipay.com,studio666/gratipay.com,mccolgst/www.gittip.com,bountysource/www.gittip.com,eXcomm/gratipay.com,gratipay/gratipay.com,bountysource/www.gittip.com,gratipay/gratipay.com,eXcomm/gratipay.com,studio666/gratipay.com,gratipay/gratipay.com,bountysource/www.gittip.com,studio666/gratipay.com,eXcomm/gratipay.com,mccolgst/www.gittip.com