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 ( )
got problem with prefix and postfix
 Done (99)
 Solved all the function and can be use
 Change evaluation to evaluateExpression name
 Add comment and description for functions
Clobber and passed all the tests
Removed the redundant evaluate function
Merge pull request #33 from jasonchuah93/master

Finally finish all lolzzz