Change action icons to official fan kit icons.
Trim action icon drop shadows and reduce icons dimensions to 42x42.
Improve display of new action icons.
Improve appearance of empty drop slot in sequence editor.
Make selected available actions look more glowy.
Link Required Cross Class Actions to Initial Guess instead of Solver Result.
Add Revert button to Sequence Editor.
De-emphasize Cancel button in Sequence Editor.
Remove unnecessary CSS for action tables.
Further improvements to action appearance.
Switch to CloudFlare CDN for AngularJS and and Bootstrap files.
Fix About page's css links.
Rename Observe.png to observe.png.
Fix body offset when navbar changes mode for narrow device widths.
Sync with master.