Changes in vimrc to backup/swapfile creation
Install script works

Install script links files/directories starting with and underscore into
$HOME. This is cool. This commit prepends all the files I want to link
with an underscore. Moving folders with submodules was tricky. Had to
update .gitmodules wth new path,
.git/modules/path/to/submodule/.git/config, and the .git file in each
submodule directory. There has to be an easier way, and there probably
is. I hope it isn't broken!
Update install script, readme, and rdark colorschm

The colour of the background for the Visual mode selected text was too
dark. I made it bright pink with dark text.
Custom PHP snippets file, minor bash & vim changes