Update CONTRIBUTING.md

* Reflect the recent changes in @necolas's Issue Guidelines:
  https://github.com/necolas/issue-guidelines.
* Add note about not opening issues and pull requests regarding the code
  in the Apache Server Configs, jQuery, Modernizr and Normalize.css.
Update to Apache Server Configs v1.1.0
Docs: Update `.htaccess` related info and links
Docs: Update section about the X-UA-Compatible meta option

Chrome Frame is not supported anymore and we removed the option in
8fc2650.
This commit removes the documentation about Chrome Frame in the
X-UA-Compatible meta tag docs.

Related to #1396.
Docs: Update the `Track JS errors in GA` section

Add column number parameter to the example to reflect the recent changes
in the specification and in the Chrome and IE 10 implementations.

http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#errorevent
https://code.google.com/p/chromium/issues/detail?id=264197

Close #1417.
Move font-related base declarations to `html`
Update CHANGELOG