Making the new mashup portlet's scrollbars look relativelly same as the rest of the UI (using the jscrollpane JQuery lib, because there is currently no way to change native scrollbars in FF so we need to use fake ones)

(cherry picked from commit e60acc22d6e297bd280fe9d8a8f14f71acb604b6)
Signed-off-by: Jirka Kremser <jkremser@redhat.com>
Increasing the height of the scrollpane for the mashup portlet, because I forgot to do that in my previous commit e60acc22d

(cherry picked from commit a83102d274ea859f54527a6587189350b05eeaaa)
Signed-off-by: Jirka Kremser <jkremser@redhat.com>