Cleanup contains method and drop _contains helper
Catch NotImplementedError in contains(), return None
Updated classify_diop() and diop_solve()
Few changes
Added general pythagorean equation
Doctests added
simplifications
Fixed a bug
Merge branch 'master' into Diophantine_Equation_Module_III
Fixed a bug
Replaced while with xrange
general sum of squares implemented
Docs added to sphinx
Fixed doctests
Fixed doctests
Fixed test failure
Power representation implemented
Doctests added
Added zeros argument
Code quality improved