Fetch bourbon/breakpoint/normalize via bower

closes #14
- Fetch libraries via bower on `grunt`
- Use breakpoint 2.0.6 due to libsass failures
- Add grunt-shell to execute bower install
- Adjust screen.scss
Merge pull request #15 from halfdan/less_bourbon_more_whisky

Fetch bourbon/breakpoint/normalize via bower
Remove old %extend placeholders
Introduce robots.txt and sitemap for docs
Re-introduce Ruby

fixes #8, #9, #10, #11
- Add Gemfile
- Swap normalize.css with normalize-scss
- Add grunt-contrib-sass task to compile sass
- Ignore .sass-cache
Remove IE specific CSS file

We've never used this anyway. It just hangs around doing nothing.
Merge branch 'master' of github.com:TryGhost/Ghost-UI

# By Fabian Becker (1) and John O'Nolan (1)
* 'master' of github.com:TryGhost/Ghost-UI:
  Remove old %extend placeholders
  Fetch bourbon/breakpoint/normalize via bower
Merge pull request #16 from halfdan/hello_ruby_you_beauty

Re-introduce Ruby
REFACTOR THE THINGS
Fix normalize.css import
Update copyright
Update license
New instructions for linking ghost-ui to ghost
Fix width bug on form inputs
Fix broken mobile inputs
Implement grunt dev task

closes #18
- Update grunt-contrib-watch to 0.6.0
- Add watch/dev task to Gruntfile
- Add Ruby to README
Merge pull request #19 from halfdan/someone_is_watching

Implement grunt dev task
Remove double shadow from dropdown hover

I have no idea why this was originally here
Very basic first pass at docs
Fix mobile bug

Tag field fade-shadows overlapping the settings icon