Add simple command line interface
credit for roll program
Use Mersenne Twister on Win32 instead of rand()

Built in rand() on Win32 only uses 15 bits which is horrible.

MT doesn't generate cryptographic randomness but that isn't necessary
for this application.
Require Math::Random::MT::Perl only on Win32
credit to Mark Allen again! what a guy!
you cannot "use" in an "if"; use if.pm instead
v0.041

          add the "roll" program (thanks, Mark Allen!)

          documentation fixes (thanks, Mark Allen!)

          use a better source of random numbers on Win32 (thanks, Mark Allen!)