nicer syntax in fieldHelpers
include only first element on "in-reply-to" field in mail references
add method to use options in mongo db queries
mail object
Merge branch 'master' of git://github.com/softwerkskammer/NeuePlattform-Implementierung

Conflicts:
	lib/persistence/persistence.js
persistency bug fix: use only one DB connection, wait for it and allow to disconnect when done
mailarchive app begin
rename mail DB field dateUnix to timeUnix
Merge branch 'master' of git://github.com/softwerkskammer/NeuePlattform-Implementierung

Conflicts:
	lib/persistence/persistence.js
call callback functions with empty / undefined result argument from testpersistence
controller and view pages for mail listings and mail content
display mail sender and time on the mail message page too
change page url for mails to "message?id=..." and send 404 error if id is not given
Add link to mail indexo to the page displaying mails
make intention of state "opening connection" in persistence.js clearer
add reference to group page from group mail index page
refactor persistency, make DB connection state explicitly tracked
rename beans and node modules "mailsApp" to "mailarchiveApp",
"mailsAPI" to "mailarchiveAPI" and "mail" to "archivedMail"
Let all testpersistence functions throw new Error('function undefined')
correct error description text