Use this tree froked from Jserv's tree

[lab-1 and lab-2]
Use this tree forked from Jserv's tree instead of this tree:
https://github.com/AdrianHuang/ncku-arm-homework.

[lab-3]
1) Added the random number generator
2) Added the gdb command in the file gdbscript
3) Replace the fibonacci function with another function (for example:
   factorial function) in gdb. This task is not completed yet.
   Still working on it.