Update const_rgx pattern to match pylint 1.3

New default value for `pylint.checkers.base.CONST_NAME_RGX = re.compile('(([A-Z_][A-Z0-9_]*)|(__.*__))$')` so additional pylint-django pattern should be inserted befere ")$".
Remove blank line
Merge pull request #17 from frost-nzcr4/patch-1

Update const_rgx pattern to match pylint 1.3