Remove deprecated methods from code base

[mattab]

See http://piwik.org/blog/2014/02/piwik-2-1-changes-plugin-developers/

We will now remove these deprecated methods from the codebase.

[mattab]

In ffec1b8: Removed deprecated methods, renamed calls to the new methods. Refs #4942

[mattab]

We got a few reports, that cacheBuster plugin has not yet upgraded to the new method name. Hopefully the author will do a new release.

It's fixed!