Plupload panel fixes

* Update plupload library to 1.5.3
* Include missed resources (for flash and silverlight runtimes)
* Minor fixes on extjs component to make it compatible with IE < 10
improvements to Updater tool, minor fixes
fixes to the updater manager plugin
add WMS Filtering capabilities to query form
fix #373
add GWC management button to the updater
improvements to the template manager style