Add ostream operator<< for Rank and Suit enums.

We previously tried to change the value of the 'Two' enum to 2 instead of 0.
Apparently that change didn't get saved. Once I re-applied the change, lots of
tests failed. Leaving it as 0 at least for now, but added a operator<< for
better debug-printing of ranks and suits.

Also added .gitignore to ignore scripts I may have in the directory to
copy files to/from other places on my local disk drive.