DS-1757:Missing images in mobile theme

Removed link to mobile-default-thumbnail.png and changed to default-thumbnail.png which already existed.
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.
Added contextPath 

Added context path per helix84.
DS-1878 make search URL recognize Lucene/Discovery in mobile theme