Merge remote-tracking branch 'nik/develop' into develop

Conflicts:
	Squeezer/build.gradle
	gradle/wrapper/gradle-wrapper.properties
Add a config file for Transifex.
Merge remote-tracking branch 'nik/develop' into develop

Conflicts:
	gradle/wrapper/gradle-wrapper.properties
Update current playlist when the current player

changes.
Update the Transifex config.

- Correct the file filter, so that files are transferred to/from the correct
  locations.

- Add a language map to just use language specific directories for the
  moment.
Correct instructions about release branches.

Format paths correctly.
Save selected album sort order on server
Fix action bar player dropdown for 2.3 and previous

The simple_spinner_dropdown_item layout for 2.3 not suitable for use with the
action bar compat theme.

So we use support_simple_spinner_dropdown_item instead.
Format filenames as plain text.
Update the action bar player spinner when players change.

- Call any onPlayerChanged callbacks when the list of players changes.

- Update the Player model to record the connected state of a player.

- Change updatePlayerDropDown to only include players that are connected,
  and only show the spinner if more than one player is connected.
Reformat model/Player.java.

- Keep fields together, ordered, and named consistently.

- Move the constructors to the top.
Merge commit '662095d9e94b7a0517b0a9f2b838f66e5fc5c518' into develop

* commit '662095d9e94b7a0517b0a9f2b838f66e5fc5c518':
  Fix action bar player dropdown for 2.3 and previous
  Save selected album sort order on server
Merge branch 'develop' into release-1.1.0

* develop:
  Reformat model/Player.java.
  Update the action bar player spinner when players change.
  Format filenames as plain text.
  Fix action bar player dropdown for 2.3 and previous
  Save selected album sort order on server
  Correct instructions about release branches.
  Update the Transifex config.
  Update current playlist when the current player
  Add a config file for Transifex.
Remove unnecessary call to registered player callbacks.

Add note indicating that changeActivePlayer() already does this. Pointed
out by Kurt.
Fix a bug where songs with no artwork were not displaying default artwork.

Caused by the switch to have a Song not return null for the artwork URL.