1. organize number with number.h and number.cpp
2. private functions only defined in cpp
3. ModularExponentiation support int64_t of param ‘a’
4. add func MillerRabin: big prime test
5. add func PollardRho: find a factor for composite
6. add func MinFactorPollardRho: find the smallest factor for composite
7. add the oj.cpp for online-judge test
8. add the solution for POJ 1811