Merge branch 'master' into Janet
Tried to implement strength calibration/tcellcount

Should change strength once t cell count hits certain level but it is
not working.
Minor fixes to keep method naming conventions consistent
synchronization
synchronizing with master

Eclipse didn't 'refresh' properly so the merge is registering as a
commit
added images to gameplay
stupid things
minor update to image
Merge remote-tracking branch 'origin/master' into Steph
Random difficulty for Viruses

After certain amount of time, viruses are introduced with random
difficulties between 2 and the current difficulty level.
Merge remote-tracking branch 'origin/master' into Steph
removed unused variables
deleted Driver class
Merge remote-tracking branch 'origin/master' into Steph
Changed min difficulty of viruses introduced
Merge remote-tracking branch 'origin/master' into Steph
Made t-cell benchmarks constants

Made final constants for the t-cell levels that would increase the
difficulty
Background description overhaul

Rewrote background description to be more succinct.
Instructions Image/Facts

Uploaded image for instructions screen. Implemented facts as private
strings in Facts.java
Merge remote-tracking branch 'origin/master' into Steph