Merge pull request #6 from chaosAD/master

Sorry this is another silly demo
Added command_prompt and historybuffer
Merge pull request #7 from darklord1310/master

Added command_prompt and historybuffer
Make the PAGEUP and PAGEDOWN can remember the last input
Merge pull request #8 from darklord1310/master

Make the PAGEUP and PAGEDOWN can remember the last input
Done merging NumberToken, OperatorToken files and added some of the files that related to StringObject and Token
Merge pull request #9 from mygamelife/master

Done merging NumberToken, OperatorToken files and added some of the file
deleted get_end_of_input() and deleted the test for it
Deleted some unnecessary code in command_prompt.c and .h
Correct the bad typing code problem
correct postfixAndInfix function
Still in the progress of writing evaluate()
Resolve merge conflict for the evaluate()
Modified handle_INSERT function, make it work as a toggle
Updated comments for all .c and .h files
Merge branch 'master' of https://github.com/Raydivine/Calculator
Done some changes in OperatorToken and Evaluate files
Merge pull request #11 from banana93/master

Done some changes in OperatorToken and Evaluate files
Merge pull request #12 from darklord1310/master

Updated code in command_prompt.c
Merge pull request #13 from mygamelife/master

Added tokenDisplay()