Set file manager config parameters from outside

I made a few changes in order to be able to set file manager config params from external code.

Use case: in my project I use CKEditor for different modules that are completely isolated from each other. Obviously, these modules use different file storage behind. Unfortunately, initial version of FileManager plugin forced me to use single file storage and didn't provide any configuration options. So, I had to modify the code and now want to share it with community.

How to use it: specify URL params when create and URL for FileManager index.html page like:
ckeditor/plugins/filemanager/index.html?relPath=http://mysite.com/blah/blah/blah&connectorUrl=http://mysite.com/connector/blah/blah/connector.ashx

If you have any questions or suggestions, please notify me.

br,
Vova