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.
Further optimize the apple touch icons

Reduce the total size of the icons by 172 bytes using zopfli.

Close #1415.
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.
Compress .png files losslessly

Use `zopfli-png` with 1000 iterations, `pngout /r` with various block sizes and deflopt.

apple-touch-icon-114x114-precomposed.png | Bin 865 -> 751 bytes
apple-touch-icon-144x144-precomposed.png | Bin 947 -> 939 bytes
apple-touch-icon-57x57-precomposed.png   | Bin 495 -> 450 bytes
apple-touch-icon-72x72-precomposed.png   | Bin 575 -> 512 bytes
apple-touch-icon-precomposed.png         | Bin 495 -> 450 bytes
apple-touch-icon.png                     | Bin 495 -> 450 bytes

The total difference is -320 bytes.

Closes #1418.
rm touch icons, update favicon