Update Metrolook

* Backporting changes from master branch.

* Some of the changes should fix issues and also add new features.

* Adds some new settings. Please go to README to see what settings there are.

* Adds more svg images. and adds more images.

* Fixes issues with webkit and chrome and other browsers that use webkit.

Change-Id: If098d79cfb9fe0886550118f242d74fbe2e8de96
Update theme.css

Removing custom I made for my wiki.
Update screen-hd.less
Update screen.less
Update collapsibleNav.js
Update Metrolook.php
Update MetrolookTemplate.php
Update README.md
Update MetrolookTemplate.php
Update Metrolook.php

Bump version to 1.3.1
Update Metrolook.php
Rename theme.css to theme.less
Update screen.less
Update MetrolookTemplate.php
Update navigation.less
Update common.less
Update search.less
Update README.md
Update README.md
Update Metrolook.php