docs: Append to /etc/modules, not overwrite

Fixes the snd_bcm2835 module not being loaded and therefore sound output not working
Merge pull request #334 from 0xadam/patch-1

docs: Append to /etc/modules, not overwrite
docs: Add woutervanwijk's web client
docs: Bind console functions in JS examples

For e.g. ``console.log`` to be used as a callback, it must be bound to the
``console`` object first: ``console.log.bind(console)``. If not, this will
cause "Illegal invocation" errors in WebKit browsers.

This change updates all our Mopidy.js examples to bind ``console`` functions
before they are used as callbacks.

Fixes #298.
docs: Prefix issue numbers with '#' instead of 'GH-'
docs: Fix syntax error
docs: Add rompr to web client list (fixes #321)
docs: Refer to HTTP clients page for web based MPD clients
docs: Fix syntax error
docs: Spotify now works on armhf
docs: Append to /etc/modules, not overwrite

Fixes the snd_bcm2835 module not being loaded and therefore sound output not working
Merge branch 'master' into develop