Don't fail on missing fields

This is more like the SDK's `cms_tag` behaviour
Show description for references
Add cms_edit_reference
Improve wording, fix typos
Update dependencies

Fixes #23
Referencelist editor look and feel

A little more like the list sorting dialog in the SDK
Linklist editor small redesign

* Sync with referencelist
* Take less screen space
Drop outdated CSS
Make Close button green

* red may imply a destrucive operation, which it isn't due to autosaving
Make linklist more robust

Still not perfect regarding internal link URLs, but supports query
params
Tolerate empty enum fields

* prevent forcing the first value as soon as the field is being edited
Edit link fields in edit view only
Link editor style improvements

* based on link list
Workaround for redactor disrespecting cleanup config
Improve HTML editor settings

* avoid losing focus on menus and popups, including workarounds (fixes
#20)
* circumvent destructive cleanups (hopefully fixes #22)
* avoid issue with re-opened redactor after save by cloning
Small style fix
Fix #26
Version bump
Merge pull request #28 from dcsaszar/develop

v0.0.14