Merge pull request #11 from janraasch/master

add travis
add grunt-cli
add travis badge
Change readme
typo
Add lesscss
add jquery custom to reduce filesize of jquery build
remove link to git account
change grunt-cli dependency
tiny change in gruntfile
clean up dev deps
add david-dm badge to readme
add grunt badge
remove jquery builder
use minified jquery version
update grunt uncss
change opacity of background images
clean up gruntfile

* split config using grunt-load-configs
* pretty print .json and .js
* add .jshintrc to keep format clean
* add time-grunt