add install instructions for Ubuntu 12.04
Update README.md
Merge pull request #61 from fs/install-instructions-for-ubuntu-users

setup instructions for Ubuntu (12.04) users
move commands to code tag
minor changes
Merge pull request #64 from fs/readme--move-commands-to-code-tag

Readme  move commands to code tag
Merge pull request #63 from vladimirtemnikov/patch-1

Update README.md
Merge branch 'master' into gulp-branch

Conflicts:
	README.md