New exercise: secret-handshake - initial version
Further development to pass a few other test cases.
Merge remote-tracking branch 'origin/minesweeper' into secret-handshake
new exercise: secret-handshake - final version
Added secret-handshake to the EXERCISE.txt file
Merge branch 'unknown-secret-handshake'

Conflicts:
	secret-handshake/handshake_test.py