Do not use queryfilter on "play next" and "add to up next" commands
Merge pull request #29 from chme/retune

Improve support for "play next" and "add to up next" with Retune
Honor the "ek" (encryption) flag for RAOP_DEV_OTHER + slight rewrite of raop_device_cb
Additional quick install info
Extra error check
Some filesystems have mtime=0 (Seafile), so add check for stamp before
letting the scanner exit with just a db ping
Modify configure script:
- make check for libavresample dependent on libavcodec (since the resample functions were removed from libavcodec)
- check for libevent 1 or >=2.1.4 but don't bail if other libevent is also present