Merge pull request #24 from chaosAD/master

Did some cleanup
re-alignment
documentation
Merge pull request #26 from shyanfeng/master

re-alignment
Merge pull request #27 from kenmunyap/master

documentation
edit NS.c that merge with wrong code
PIC18Simulator and master removed
Merge pull request #29 from shyanfeng/master

edit NS.c that merge with wrong code
Minor edit
Final
Do unit tests and corner tests for evaluatePrefixNumber
Did unit test and corner test for evaluatePostfixInfix
Replace test_interpret.c
Merge pull request #32 from jasonchuah93/master

Replace test intepret.c
Added test on when get a number the loop stop
Prefix without loop
Change the parameter for evaluatePrefix and evaluateP[ostfix
Doing evaluateExpression function
Trying to code tryEvaluateAndExecutePostfix
Do test for ( )