sources that don't submit documents are 'pending' and don't get displayed by default. fixes #302
added comment to explain what pending is
Merge branch 'develop' of https://github.com/freedomofpress/securedrop into pending-source
Made "delete collection" and "delete selected" tests submit a message after creating a codename. This way the sources aren't pending.
Merge pull request #343 from micahflee/pending-source

Pending sources