fixed issue with create() when scheme not provided. unclear what the pro...

[hax@metaverse burst]$ burst
  _                _   
 | |__ _  _ _ _ __| |_ 
 | '_ \ || | '_(_-<  _|
 |_.__/\_,_|_| /__/\__|

>>> c('www.google.com')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/burst/http.py", line 376, in create
    """.format(url, host))
  File "/usr/lib/python2.7/site-packages/burst/http.py", line 67, in __init__
    raise BurstException("No hostname: " + str(url))
BurstException: No hostname: www.google.com

Unclear that missing scheme is the problem. Modified so 

>>> c('www.google.com')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/burst/http.py", line 378, in create
    """.format(url, host))
  File "/usr/lib/python2.7/site-packages/burst/http.py", line 65, in __init__
    raise BurstException("No scheme provided (http:// or https://): " + str(url)) #could probably just default to http://
BurstException: No scheme provided (http:// or https://): www.google.com