Support for adding classnames to columns in colModel

This enables the posibility to add custom classnames for any column through the colModel object. Perfect for adding hidden-phone classname in responsive designs. 

example: 

....
colModel: [{title:'ID', name : 'id', className:'hidden-phone',
....
dict now can be extended for every grid. Options now can be in html in json format.

if rowList set in 0 all rows will be shown.