renamed front end test fiels
added prettyprint for array access
modified test files
Merge branch 'frontend' into backend_array
clean up frontend tests directory
printing for array pitch and sound literals implemented
moved type literal evaluation to be lexed before identifiers in scanner. This is the right order of evaluation, do not change it
merged backend_array with front end. fixed merge conflicts
implemented variable assignments
readded test-if.llb
array access implemented
implemented assign value to array index
Added Binop operators for doubles, floats, and booleans.  Tested using backend\ tests/testOperators.llb
Merge branch 'backend_array' of https://github.com/peterxu422/PLTCompiler into backend-mixdown
mixdown works calling it once, with one sound[]
added jfugue-4.0.3.jar