Bump v1.3.0

* Move contents directory to separate git repo and fetch it as git-submodule: https://github.com/ixisio/andreasklein_org-contents
* Update npm dependencies to latest version
* Add JavaScript Code Style Checker (JSCS)
* Refactor Code Style
* Clean up some less styles indentation
* Add social profile link rel to <head>
* Add indieweb Authorization endpoints
* Remove express-device
* Rename main to core.css
* Remove mobile avatar image
* Remove Open-Sanse true-type font format
* Remove icons eot format and remove .eot file
* Remove underscore.js from npm depedencies
* Migrate jade to v1.7.x
* Migrate express to v4.x
* Remove mobile stylesheet and text-image-block elements