Merge pull request #4 from kerryb/adam

A few minor tweaks...
Update README to mention external dependencies
Remove ++ and -- so that + and - work again
Add smooth scrolling
Make Q work like q
Add lusty-juggler for faster buffer switching
Update colors schemes
Minor tweaks to 'define' and control' in the adCode colorscheme
Make SignColumn the same colour as the normal number column
Show GitGutter all the time, even when there are no changes
Fix ruby constants color in adCode
Remove vim-dispatch in favour of just running rspec
Remove color from RSpec so that it works with GVim
Colour RSpec output when in terminal vim