fix/Grid - jsSearch

[ibelar]

Some minor fix/improvement to Grid, jsSearch and js package:

Grid

• add property for setting sort parameter in url.
  Grid::sortTrigger

jsSearch

• add property for setting input initial value, for example when page need to be loaded using a query parameter.
  jsSearch::initValue
• add property for setting jsSearch not to use ajax reload but rather reload the entire page.
  jsSearch::useAjax Default to true.
  useful when model query need to be control via url parameter and entire page reload is needed.

jsPackage update

• update jsSearch plugin accordingly
• refactor jQuery helper function file in order to include a new url function: $.atkRemoveParam
• fix plugin.js where calling a plugin function prior to it's instantiation was causing issue.