Some fixes on mapstore manager

* Fixes manager release css. Now is a folder, not a file.
* Copy `adminUrl` on the Manager configuration.
User manager improvement

* Add `addManageGroupsButton` option to the plugin

With this option we can hide the group management button.
User manager fixes

* Fix headers for user group integration
* Fix headers for user group management
More fixes/improvements to the MapManager/WebGIS interaction. Close #378.
New admins can delete themselves from the usermanager. Close #380.
add session management and authkey moved to source
removed layers from default context
moved authParam to login config
merged fixes with master
Merge branch 'alediator-some_fixes'
Merge branch 'master' into HE_Customiz
Fix plupload panel on IE < 10

Fix relative URL for flash and silverlight resources on plupload panel (these URLs are different in release deployment than the debug environment)
Merge pull request #376 from alediator/mariss-16_hide_group_manager_2

User manager improvement
Media content on plupload panel fixes

* Move plupload media content to a new media folder
* Use this folder on configuration
Merge branch 'plupload_IE9_release_2' of git://github.com/alediator/mapstore into alediator-plupload_IE9_release_2
Merge branch 'alediator-plupload_IE9_release_2'
merged with plupload fixes