gists: allow copy content to clipboard

diffs: show copy-to-clipboard next to diff files

binaries: cleanup new upcomming rc-* commands that will replace paster * commands from pylons

repo-auth-tokens: UX, set and disable to VCS scope if selected an repo from select2

repo-data: fixed missing parameter we used to propagate JS with. - was breaking the repo selectors

error-page: use custom causes for 500+ errors

auth: because we use 404 for access denied too. Show proper message about it in error page

users: ported controllers from pylons into pyramid views.

tests: fixed some more test issues during stress tests runs.

tests: fixed tests for random dict order could sometimes break the tests