Fix for rendering block images

Change-Id: I4e5317f128f2b3f6742e7ed280c96fde37f52bb4
Fix incorrectly written CSS that was affecting all table cells on the page instead of cells in mwMetaDialog only

Change-Id: If3d01346d7267aec444d573ac83516083a3689bc
Merge changes If3d01346,I4e5317f1

* changes:
  Fix incorrectly written CSS that was affecting all table cells on the page instead of cells in mwMetaDialog only
  Fix for rendering block images