3.0: differentiate between unroutable and unknown
Hotpatch: Adding retry loop on handle_call for race conditions where the conference was not in the etc lookup
3.0: improve hold music handling

Update cf_park to use custom music on hold if available
Update ecallmgr_call_command to pass path for hold_music to endless_playback
directly (rather than setting the channel_var first)
Update spec/tickies
KAZOO-1064: Fix Add number
3.0: tweak the default unknown-error-message to be more inline with the meme
KAZOO-1576: do not mangle the to-uri
KAZOO-1575: added ignore_completed_elsewhere to sip properties, when set to true calls answered by other phones will still be marked as missed on the device
Merge pull request #135 from 2600hz/KAZOO-1064

KAZOO-1064: Fix Add number