Update README.md

* Made Uninstall directions more clear. If you're going to allow for copy paste installation, you might as well do the same for Uninstall.
* Added requirements which I learned _after_ I installed it.
Update README.md

Made Uninstall section make more sense.
Merge pull request #127 from jacobvanorder/patch-1

Update README.md
remove redundant uninstall instructions
add install script
add post install message
Update installation instructions in the README
Fixed missing quote for creating PLUGINS_DIR

Resulting in this install error: 
tar: could not chdir to '/Users/jean/Library/Application Support/Developer/Shared/Xcode/Plug-ins'
update Gitter room
Merge pull request #139 from jeanregisser/master

Fixed missing quote for creating PLUGINS_DIR
apply consistent  on variables
Add plist key for Xcode 5.1
update versioning system
update versioning system
updated project
wtf vim
remove install, who was even using this?
Bump version 1.0.3
fix Makefile path resolving
remove draft flag