Fixed webkit browser filter dropdown position
Facet values now cleaned up using htmlspecialchars

An example dataset contained html fragments in the facet
values.  These messsed up rendering the controls on the
page.  Issue was fixed by getting clean data but this
patch should improve the robustness of the htmlpivotviewer
if something similar occurs.
Regenerated distribution files.
Fixed bug introduced with previous patch
Regenerated distribution files
Added empty deepzoom collection error message
Added NEWS file
Changed text colour in the table
Regenerated distribution files