Use Underscore's isEqual in shouldComponentUpdate
Prefer em unit in frontend stylesheets
Bugfix on account edit
Fix regression on message patch
Fix regression on display of next message after move
Small refactoring of message store
Fix filepicker tests
Fix display of message with remote images
Update JSON-Patch library
Fix for messages without date
Add setting to confirm message deletion
Allow to undo last delete
sync mailboxes WIP
Revert "sync mailboxes WIP"

This reverts commit f4f0968c09ba956d9bb83314e605d021ccb56155.
save lastsync after full sync of a box
add mailboxes sync
bugfix attachments handling
code clean
tests new functions