Fixes bug 843867 - Added a JSON server status endpoint.
Merge pull request #305 from AdrianGaudebert/843867-server-status-json

Fixes bug 843867 - Added a JSON server status endpoint.
bug 844962 - topcrashes with os_name None sometimes
Merge pull request #306 from peterbe/bug844962-topcrashes-with-os_name-none-sometimes

bug 844962 - topcrashes with os_name None sometimes
bug 843730 - calling Bugs model API without signatures, r=rhelmer
bug 843730 - no signatures no topcrasher widgets, r=rhelmer