Add hemisu.vim color scheme.

Looks good on Mac OSX Terminal.app; original source:
https://github.com/noahfrederick/Hemisu
Gary Bernhardts (destroyallsoftware.com) colorscheme grb256
add gruvbox
detailed, frood, and kyle added
Added simple install to README.md
Update README.md

Very simple install
Add correct working railscasts colorscheme
Make php highliting almost identical to github (requires php.vim)
Php.vim seems to have links with higher priority
Added bubblegum.vim
Added getfresh.vim
Added luna.vim
Added bubblegum.vim
Added getfresh.vim
Added luna.vim
Merge pull request #1 from Morley93/master

Morley93 - Added three new colours.
Changed around README slightly, more generic
Missed updating the install instructions
Adding tomorrow night theme
jiks.vim: a mod of vividchalk