Make the querystring "anti-cache" feature configurable

[fredck]

The anti-cache feature we have in the editor is generally useful, but may also be an issue on certain cases (as commented in our blog).

To give the proper level of flexibility, we could make this feature configurable, so one could decide to not use it. We'll probably need a global variable for that, like "CKEDITOR_NO_ANTI_CACHE".

[fredck]

Humm... it looks like it should be enough to set CKEDITOR.timestamp to an empty string right after loading the editor code. The only problem is the config.js file URL is built on the core code execution time, so the timestamp will always be there.

more investigation is needed.

[garry.yao]

The correct way for configure this should be simply remove the CKEDITOR.timestamp value.

You'll need to update editor's test profile for this TC, as well as point 'CKEDITOR_ROOT' environment variable to a released folder.
 http://ckeditor.t/tt/4549/1.html.

[garry.yao]

Fixed with [4585] at 3.1.x branch.