Add DSA interfaces
Change public_key from abstractproperty to abstractmethod
fix pep8 errors
Change property names to be consistent with RSA
Remove bitlength related properties that are not needed
Changed docstrings to conform to lastest updates of the interfaces
Fixed typo
Change pub_key and priv_key to y and x respectively
Merge remote-tracking branch 'upstream/master'
Change name of divisor to subgroup_order
Fix pep8 issues
Fix DSAParams generate method to eliminate ambiguity
Change params to parameters
More accurate docstring
Remove DSAParams generate method as it will be implemented as a classmethod
Change parameters from abstractproperty to abstractmethod
Added documentation for the DSA interfaces
Annotate aliases in the DSA documentation
Define DSA in the documentation
Change keypair to key pair to pass the sphinx spelling test