queue: work around parse_command_line() ignoring the first argument

queue: add hook handler (only for bitbucket at the moment)

viewer: use thread-local IOLoop instance (recommended by Tornado docs)

viewer: pass listen address to listen() as a positional argument

requirements: works with Tornado 4.4

viewer: add initial delay to mascots popup animation

utils: adopt now() (renamed to timestamp()) and parse_timestamp(), test them

utils: a small module for shared functions, the first of them is rel()

checker: remove duplicate "job failed" message Now that every failed run() is covered in the execute() by return False, one such message in wrapper() is enough.

checker: print requested linters without duplicates Also, some linters could come preinstalled (compiled, as distro packages), so they don't necessarily need to be installed.