Merged r8113 from trunk (#9738).
Merged r7920, r7921, r7922 and r7924 from trunk (#9405).
Merged r8103 from trunk (#9737).
scm: git: remove unused --since option (#4547, #4716, #7146, #6013)
Issue destroy is now DELETE only.
Removed no longer working old wiki route.
Droppped old repositories routes.
Changed ProjectsController#destroy to DELETE only.
Changed IssuesController#destroy to DELETE only.