One too many 'not's
urlparse does strange things.

>>> from urlparse import urljoin
>>> end_point = "https://api.digitalocean.com/v2/"
>>> url = "droplets"
>>> urljoin(end_point, url)
'https://api.digitalocean.com/v2/droplets'
>>> url = "/droplets"
>>> urljoin(end_point, url)
'https://api.digitalocean.com/droplets'
Merge pull request #41 from andrewsomething/fixes

A few random fixes