Merge pull request #7 from auscompgeek/master

allow emptiness in regex again
Tried to fix unicode errors, failed. But cleaned up the way it uses the
search api. And fixed a potential bug. And fixed this tabs shenanigans,
everyone use spaces from now on! And .format()!
Let's switch to py3 soon. /longcommitmessage
Also relevant: http://i.imgur.com/y7Hm9.jpg
made main ninjabot file unix-executable
Merge pull request #9 from cyphar/master

Make ninjabot.py unix-executable
made commands like 'word stop' work when they should work (a previous guess or an invalid guess)
Merge branch 'wordgame'
fixed up horrible indentation
Merge pull request #10 from cyphar/master

Made wordgame commands work when they should.
modernise regex and tr a bit