Simplifies calculation of intersection of two circlces (#3)

minor correction

update PyBoy submodule

Most important thing is corrected opcodes_gen. Some other less important stuff: Removed redundant code. Added a more explicit comment regarding what's missing in circle intersection. fixed is_prime, fixed rsa example, fixed line import

fixed decorator order

fixed readme

edited readme, removed redundant 'plot.py'

Moved to clean repo

Initial commit