panels 7.x-3.1

Changes since 7.x-3.0:

• CSS cleanup plus hide IPE toolbar when overlay is open to prevent bad clicks.
• #1396600: Fixed IPE Add / Delete / Move not working on regions with underscores in their name.
• Fix problem with layout editor 500 and notice.
• #1178334 by bsuttis: dashes in pane suggestions caused problems.
• #1300284 by XerraX: Fix rounded corners CSS during aggregation.
• #1173978 by das-peter and dixon_: Preent notice on caching tokens.
• #1463746: Don't render contextual links if module doesn't exist.
• #1458900 by populist: Add pane object to form state when editing a pane.
• #1436062 by Letharion: Removing mini panels with blocks module off causes error.
• #1230324 by Amitaibu: Pass $display to hook_panels_pane_content_alter
• #1379538 by mukhsim: Allow custom body classes in panel variants.
• #1271404 by tim.plunkett: Update layout plugin docs.
• #1008956 by cheekdotcom and mgifford: Apply keyboard commands to flexible sliders.
• #1417762 by haiiro.shimeji: Fix pane id acquisition to properly use jquery ui
• #1463782 by das-peter: Fix caching of inline js
• #1434142: Fix problems with IPE not understanding the proper IDs of added panes.
• #1471190 by kmonty and nicelobster: Redesign the look and feel of the IPE.
• Fix broken cancel confirm which did not properly not cancel when you cancel.
• #933748: Make add content modal themable.
• Not sure how this did not get committed.
• #1477778: Improve layout selector UX.
• Followup to last commit: Remove the gears when changing layout.
• #1249336: Allow the IPE to change layouts.
• #1444734: IPE lock breaking was never upgradted to D7 properly.
• #848704: Fix blank div being inserted by IPE into sortable containers.
• Fix a couple of minor errors with the IPE.
• Tell Panels_fields not to register theme for its view style. See #1268412