Initial commit of sympy solver. Update the use of it in PrimeFactorizationEquationGenerator.py

 Changes to be committed:
	modified:   PrimeFactorizationEquationGenerator.py
	new file:   sympy_solver.py
Add author details and small tidy up

 Changes to be committed:
	modified:   sympy_solver.py
Merge pull request #1 from tanbur/master

Sympy solver initial commit