scald 6.x-1.0-beta3

See also SA-CONTRIB-2013-060

Changes since 6.x-1.0-beta2:

• MEE: Sanitize the atom title before display in the Ressource Manager
• DnD: Simplify the caret location magic after a drop
• Scald DnD Library: Don't hardcode the default sort, use the first sortable field
• DnD: Completely remove remainings of the per editor library.
• DnD: Make the snippet themable from the JS layer
• DnD: Put an &nbsp; into the empty <p />, to accomodate TinyMCE
• DnD: Fix library refreshing
• Optimisation of icon images
• Scald Core: Fixing some notice for atom types not associated to a transcoder.
• MEE: Atoms dropped into an empty <p /> were wrongly placed at the end
• DnD: Get the library to show even without MEE fields
• Task #1570594 by DeFr: Update documentation for hook_scald_atom_quickadd
• Scald Core: Update the HOWTO a bit
• Scald Core: Add a variable to prevent user being registered as authors