* implemented logging of project and system web hooks
* implemented UI for user area (project hooks)
* implemented UI for admin area (system hooks)
* implemented retry of logged webhook
* NOT imeplemented log remover

Rename other URL generators

admin_builds_path -> admin_jobs_path

Fix tests and more renaming

Fix more tests

Also change build_id to job_id in the controller

Add test.js and test.css to disable animations during testing and include these in _head when testing

Add test.js and test.css to disable animations during testing and include these in _head when testing

Remove slash commands from Markdown preview and display their outcome next to
the text field.
Introduce new "explanation" block to our slash commands DSL.
Introduce optional "parse_params" block to slash commands DSL that allows to
process a parameter before it is passed to "explanation" or "command" blocks.
Pass path for previewing Markdown as "data" attribute instead of setting
a variable on "window".

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Updated JS that was causing the hints to appear & then disappear