Finished a display method for arranging the ciphertext and plaintext text areas.  Doesn't link to actual cryptogram objects yet.
Merge branch 'master' of https://github.com/williamhc/PG13 into add-create-screen
Created all the gui elements for the create screen, including all of the descriptive elements, as well as the plaintext box, and the preview screen

Started implementing the preview screen (which will also be used for the play screen), but updating each letter when a character is not currently working (ideas?)

A few changes made to the cryptogram class
Fixed isCompleted so that it uses the interface method

Fixed test cases so thart tests that test cryptogramPair are there own class
Fixed some method in cryptogram
Fixed AllTests (weird imports and stuff)

Added comments to decrypt in Cryptogram

Altered CryptogramTestFile now that isCompleted and Decrypt are different
Fixed the updating on the letters, so that now they work.  Entering one letter causes all others for that same ciphertext character to also change.
Changed the size & font of the letter widget boxes for the cryptogram.

Implemented a rudimentary Check Solution button (prints to console).
Fixed the shuffle algorithm for the cryptogram key so that it actually performs a shuffle.
Merge pull request #9 from williamhc/add-create-screen

Add create screen