Restore original settings

[Tafhim]

I have implemented a restoration functionality that helps the user restore all their previous setting of vim (.vim, .vimrc) and bash (.bash_profile, .bashrc) to their original state before executing this script. The user can choose whether to 'install' or 'uninstall' by specifying the string as a command line argument. The README has been updated to reflect those changes. Now we also take a backup of the .vim directory in order to supply the original settings in full.

[mislam]

A nice rule of thumb would be:

1. Never work on master branch.
2. Before you start working on anything, create a new branch from master.
3. Work on that new branch, do multiple commits for your convenience if necessary.
4. When you're done, squash all commits into one.
5. Before you do a PR, make sure you rebase with master so that all new changes on master reflects on your branch. Otherwise you we will get merge conflicts.