allow plugins to hook into API
allow to hook into chart after-publish actions
..
allowing plugins to load additional JS/CSS files
chart actions
Merge branch 'master' of github.com:datawrapper/datawrapper
removed unused template
allow plugins to include assets
coping plugin templates
bugfix
convenient check if plugin is installed
generic controller for plugin templates
ignoring plugin templates from repo
update-messages now also parsing plugin templates
refactored image export into plugin
more verbose error mails
updated messages after cleaning cache
added helper function for sending mails with attachments
cleaning