Use pretty 404 pages in repo.HTTPBackend

path.Dir can't handle Windows case, must use filepath.Dir

Implemented participant-listing for issue-pages (Fixes #2377)

Fix syntax highlighting for markdown code blocks on issue description/comment save

Fixes #2447 (delete public key from authorized_keys)

Change en-us localization "mirror from"  to "mirror of"

Remember last selected clone protocol

Make highlighted markdown code blocks work on issue pages

Use icon repo-forked instead of repo-lock for private, forked repos

Add portuguese-BR to home template.

Show all orgs on user profile, except the private one's

Allow modification of a release if Content is empty (fix #2516)

Fixed gravatar url

Update Docker container with Alpine 3.3 & Fix RPi2 build

- Dockerfile.rpi now uses hypriot/rpi-alpine-scratch as base (build script are available w/ a better maintainer & more updates)
- Dockerfile.rpi updates alpine from v3.2 to v3.3 to be on par with Dockerfile

- Dockerfile now uses alpine:3.3 as base
- Dockerfile.rpi now uses v3.3/community repository without pinning
- Go package is no longer fetched using repository pinning
- Fixes problem while using repository pinning & virtual package at the same time

[ci skip]

[ci skip]