[DS-1744] Upgrade to latest log4j
[DS-1832] Proxy configuration set in system properties if empty
DS-1757 Missing images in mobile theme

Removed link to mobile-default-thumbnail.png and changed to default-thumbnail.png which already existed.
Added contextPath
DS-1756 Wrongly aligned text on mobile theme

Removed margin-left: -35px; which pushes "There are no files associated with this item." over to the right. I tested this in firebug.
DS-1878 make search URL recognize Lucene/Discovery in mobile theme
DS-1881 Remove filter button in XMLUI Discovery filters deletes all "New filters"
DS-1816 add missing DSO type to DRI (focus.containerType)
DS-1879 Do not require ADMID for bundles in METS