supervisor: deleted left over templates after removal of supervisor controllers.

security: fix self xss on repo downloads picker for svn case.

release: merge back stable branch into default

tests: updated pytest.ini

navigation: moved registration of nav registry to it's own function. We can re-use it in EE tests better.

middleware: code restructure

settings: removed not used supervisor views/models. - this isn't going anywhere, and it's a dead code that has been replaced by the processes page.

navigation: allow passing already found registry

navigation: change the code for pep8 to stop complaining

dependencies: bumped mistune to 0.8.1