Make tests more informative
Start adding flags for journalist reply.

See Issue #140. Journalists should flag sources that
they want to reply to so we can generate keys for the
source only when needed.
Don't show _FLAG files
UI improvements to flag
Source-side flag checking
Remove comment that is not true
Modify test_reply with new flagging feature
Minor reply test improvements
Merge remote-tracking branch 'upstream/flask-rewrite' into feature/lazy-keygen

Conflicts:
	modules/deaddrop/files/deaddrop/journalist.py
	modules/deaddrop/files/deaddrop/source.py
	modules/deaddrop/files/deaddrop/test.py
Merge branch 'feature/lazy-keygen' of https://github.com/diracdeltas/securedrop into diracdeltas-feature/lazy-keygen

Conflicts:
	modules/deaddrop/files/deaddrop/journalist.py
	modules/deaddrop/files/deaddrop/test.py