docs: Add Mopidy-Yamaha extension

(cherry picked from commit 546507fa97dc1f863b8341ec506e5bb4f6418401)
docs: Add Mopidy-InternetArchive extension

(cherry picked from commit cce6d43fcff5a316997229cf9b1eeb9286061859)
docs: Add link to coveralls.io

(cherry picked from commit be0f1ee70433ef55dda082a7c5bf56ac6b52ff44)
docs: Add Mopidy-TuneIn

(cherry picked from commit 590ce19148ad4ff4e17c1a57d8443f5a6895af17)
Add: YouTube extension
(cherry picked from commit 9b1ec31fd1aa6ddfabbbd8e89773ee0e7063d0f7)

Conflicts:
	docs/ext/external.rst
docs: Add Mopidy-Podcast-{gpodder.net,iTunes}

(cherry picked from commit 95a051abf8ff82b9b3f0484e2d343a6fc91fdfaa)
docs: Should install gstreamer0.10-alsa before using alsasink

(cherry picked from commit 9db9def367d02aef9d075721b5ce829649e61325)
docs: Make 'mopidy config' more prominent

(cherry picked from commit afbd9895bfae15e2f33b3bc1ffd6b5ea6ea3f542)
docs: Add page for the Debian package

(cherry picked from commit 9f6610a144b4205753fea61d75b7c214fa07478e)
docs: Fix typo

(cherry picked from commit ae63cc633cc91b06f999ff0ed29aab0ae892c24b)
docs: Fix typo

(cherry picked from commit adb817ecfe18c6663eca06bfb6d6989cede63d41)
docs: Add Apollo player to web client list

(cherry picked from commit a311f3ca08f0ce588774c682791d8949dec7b4a7)
docs: Remove client screenshot to not grow packages with 3.5MB

(cherry picked from commit b587b47e86f43809286f9a4b9bed9a9081bf1249)
docs: Remove link to outdated Vagrant image

(cherry picked from commit 25e1aeb417f5982797262650f0b6e208018241bc)
docs: Fix typo

(cherry picked from commit e323afb427f4f64e057258c96fe53a322a0af678)
docs: Update pip command for installing dev version

(cherry picked from commit 211c4e924804f431b02edd71ad46e71a6fc7d7aa)
docs: Document proxy/{schema,port}

(cherry picked from commit 902064de73d7b76a0496f6224094345b04cb5ada)
docs: Prefer `echo ... | sudo tee ...` over `su -c ...`

(cherry picked from commit b5c6af8d9612ec435aeaad41050cc4c5cc3054a7)
docs: Fix typo

(cherry picked from commit 0bb83d79a55d2d79ca78a34b917326c171644bb7)
Update screenshot for Lux

(cherry picked from commit 40aaa915cb960574c405351f108277d9f45793f8)