Added a function displayName to Member that returns the member's full name.
We can send mail :-)
Now the app can send mails via UI input (currently not yet attached anywhere).
Split configuration examples in order to satisfy jshint.
We do not want to check backup files of any editors (e.g. Emacs' *~ files)
Code cleanup and beautification.
Extracted groups with checkboxes to a mixin.
getGroups function.
BCC field of a message can be filled by the email addresses of the members of the groups passed in as argument.
Now we can send an invitation to the members of one or more groups.
Added error handling in createClient.
Renamed directory.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	config/beans.json
	package.json
Adjusted beans and renamed API file.
Adapted everything to renaming mail -> mailsender.
Mail sending page should only be accessible for admins.
Merge pull request #213 from NicoleRauch/master

Erster Entwurf: Versenden von Einladungen an Gruppenmitglieder
Invitation button for activities (only for admins).
Filling the compose form with predefined texts. (selecting the group does not work yet)
Now the message has a markdown element, and the transformation to HTML is only done in the mailsenderAPI.