Maintenance release with some development.

Bug fixes, stability improvements on poor networks.
Buffering and flushing works somewhat better, though still not bulletproof.
Work is in progress on being able to quickly stop using the ALSA sound device to enable other sound apps to use it:

• Pausing immediately closes the ALSA device, playing tries to open it and use it.
• Sending a SIGUSR2 to shairport-sync will cause it to send a pause request to the client. If the client is iTunes, it will immediately pause.
• If shairport-sync has been properly daemonised (with shairport-sync -d....) then shairport-sync -P will run another copy of shairport-sync which will send a SIGUSR2 to the shairport-sync daemon and then exit, causing the daemon to ask the client for a pause. The copy of shairport-sync might need to have root privileges.

Extra options, bug fixes, stability improvements

New -t option to control "busy" behaviour.
Enhancements to -B / -E options.
Bug fixes, especially fixing a bug that may cause output Sync to go silent after a few hours.
Stability improvements on poor networks.

Version 2.1 supports libsoxr

Optional build with support for higher-quality interpolation based on libsoxr
Option to vary or turn off resync behaviour
PolarSSL as an alternative to OpenSSL
Bug fixes

First release

Reasonably stable first release.