* Implemented emoji autocomplete.

* Changed emoji access url.

* Reverted vendor css to default, moved all style changes to _tribute.less

* Made no-results overwriteable, added missing autocomplete to edit issue field.

Signed-off-by: modmew8 <modmew8@gmail.com>

* new issue mention

* Mention completion on new issue and view issue page.

* Code format.

* Require tribute in pull request page.