Merge pull request #47 from mdamt/filePreview

File preview
Free selection of recipients and cc's
Unmark private
Select a new head in an organization
Hide save button after cancelling new head selection and select another organization
Add mime
Add lodash
Generate reviewer list
Add mocha
Add should
Move old unused test
Move old unused test
Move old unused test
Move old unused test
Refactor create draft
Activate journal
Documentation
Open db first
Edit letter
Add callback in save operation because of writeconcern