stylesCombo_stylesSet doesn't work for full url

[alfonsoml]

The code tries to split the configuration entry based on ':' and get a maximum of 2 splitted blocks, but the way that split() works is just ignoring the rest, not putting everything in the second value.

So using

	config.stylesCombo_stylesSet = 'default:http://ckeditor.com/apps/ckeditor/3.0/plugins/stylescombo/styles/default.js?t=97KD'

means that it will try to load a file from the "http" url

This could have been avoided easily choosing any other separator as long as it isn't a valid part of a url.

The patch provides a solution without changing the separator, because although no one is able to use the full url setting, some people might have used the name:relative url syntax.

[alfonsoml]

Proposed patch

[fredck]

At this point, let's make it totally generic, working even with more than two ":". the code can be even simpler.

[fredck]

Fixed with [4365].