change INPRODUCTION constant from false to true so that words can't be entered while in pause
Revise so tiles go blank during pause

* boggle word entry has already been disabled during pause

* now, prevent players from pausing to figure out words that are available

* pause is an important feature (users should be able to put the game on hold), but we don’t want users to take advantage of, and cheat using, pause
Merge pull request #97 from alanflorendo/improved_pausing

Improved pausing