Update pycurl
Move checks clases to core
Fix exception
Fix StringIO import
PEP8
Replace string.letters with string.ascii_letters
Fix core import
Update __init__ imports
Update tests for new structure
Exclude coverage test runnder for python 3
Fix exception
Update tests to respect byte
Fix ServiceFactory
Update django-braces version
Amend json response test
Update json response test
Change response.__str__ to serialize
Fix json response test
Raname xrange to range
Fix coding