CheckPrime

Added a module with isPrime function. It has been checked on numbers
that less then 10000.
Also, some minor fixes were made in bigInt module.
checkPrime

A module with isPrime function has been added. It has been tested on
numbers that less then 10000.
Also, minor changes to bigInt module has been made.
git magic...

Got some troubles with syncing...
pre-merge commit
Merge branch 'new_branch'

Conflicts:
	rsa/bigInt.cpp
	rsa/checkPrime.cpp
	rsa/checkPrime.h
	rsa/main.cpp