Fix install script with bash and some ssh and git cheats

I changed the install script to bash because I feel as though bash is better suited for the install.  sudo ./install is still the command to install.  What happens is that the cheat command is copied to /usr/local/bin and the .cheat directory is recursively copied to the user's home folder.  This will not affect all the users on the system.  May want to implement some skel changes in the future.

My ssh and git cheats are just ones I always look for and cant remember.  ssh -i allows for pem files to be used and I added git commit -a and git push cheats.