Specify bash-bang to run Koans easier

Signed-off-by: Mikhail S. Pobolovets <styx.mp@gmail.com>
Ignore *.beam files

Signed-off-by: Mikhail S. Pobolovets <styx.mp@gmail.com>
Readme update

Signed-off-by: Mikhail S. Pobolovets <styx.mp@gmail.com>
Merge pull request #12 from styx/master

Add #! to scripts to run easier