Cross off words as they are used in a sentence
Account for lowercase

Also use the correct subset index of order.

There was a bug where it would be `"deliberate".indexOf("a") != -1`
which would count deliberate because that condition evaluated to true.
Correctly spell triumph
Merge branch 'feature/cross-off-words' into dev
Merge pull request #50 from wlaurance/dev

Cross off words as they are used