Fixing erroneous missing line in code coverage report

I guess this is a bug in coverage.py somewhere, but
previously the "continue" for where we couldn't get version
info from an app in INSTALLED_APPS was tagged as missing
from tests. Shuffling the code around made this go away, and
I think makes for more readable code.
Removing pointless temporary
Version bump
Change the way we raise exceptions to trigger error handlers.

Calling handler(403|404|500) directly is a bad idea - since
it seems to mean we don't go through the normal error
handling code (e.g. loggers don't get activated for 500s).
Fixing missing backtick in documentation.