Always show inbox and all-mail folders in navigation (even if empty)
Handle the loading of empty folders
Make sure cc/bcc header set with valid value

Supposed to fix #274, value passed to $header is neither empty nor only white space.
put 'from' and account name in mailto handler
Merge pull request #295 from PoPoutdoor/fix-triple-new-mail-sent

Make sure cc/bcc header set with valid value
Merge pull request #296 from owncloud/name-in-compose

put 'from' and account name in mailto handler
also disable account switcher on sending mail
also hide account switcher on send from mailto handler
Merge pull request #298 from owncloud/disable-name-switcher

also disable account switcher on sending mail
Merge pull request #292 from zinks-/always-show-inbox

Show inbox if empty + handle empty folders
adding folder view based on marionette views
use handlebars by default in marionette views and keep folder list during mail setup