Commands take time.  Each turn has 10 hours.

Once the hours run out, the only option is to end the turn. Everything
except taking classes takes 1 hour.  Courses take the time specified
in the json file.
Added space between colon and time left.  Fixes #60.
Merge pull request #66 from ChodeGames/add_time

Commands take time.  Each turn has 10 hours.