Removed peekBack, cleaning up comments.
Removed peekBack, cleaning up comments.

sgentle/coffeelint,emorikawa/coffeelint-cjsx,swang/coffeelint,zmbush/coffeelint,sagemathinc/coffeelint-cjsx,AsaAyers/coffeelint,clutchski/coffeelint,lydell/coffeelint,cskeppstedt/coffeelint,AsaAyers/testing-default-branch,mitar/coffeelint,machadoit/coffeelint