*8774* Use category accordion on plugins grid
*8774* Introduced grid changes
*8774* Introduced category items data variable, added number of category items
*8774* Added flag to column span category rows
*8774* Hide search control by default, add link to make it appear
*8774* Fix space between columns
*8774* Tweaks after code review
*8774* Introuduced compressed png sprites file
*8774* Fixed category rows left border element for IE8
*8774* Fixed control rows not closing when collapsing a category
*8774* Fixed non array warning
*8774* Merging (some conflicts with Alec work in styles), fixed grid search link, fixed sprites icons size