Add PEP362 functions from Python3 inspect module

Add funcsigs module to the begin package derived from the PEP362
functionality from Python 3.3.0's inspect module. Unit tests have also
been derived from the PEP362 unit tests of Python 3.3.0.
Syntax port to add Python2 support

Make syntax changes to make the module valid Python2 syntax as well as
Python3.
Syntax port to add Python2 support

Make syntax changes to make the module valid Python2 syntax as well as
Python3.