Adds DEBUG conditional to NSLogs
Added notifications for endpoint additions/removals, and moved destinationRemoved/sourceRemoved delegate invocations to after source/destination has been removed
Implemented source delegate multiplexing: Can now have multiple delegates per source; don't retain PGMidi delegate (avoid retain cycles)
Replaced enableNetwork: with readwrite networkEnabled property
Added +midiAvailable check
Fixed endpoint name retrieval
Updated default MIDI client identifiers to "PGMidi" from "MidiMonitor"
Implemented support for Virtual MIDI
Added regular device scanning to overcome apparent unreliabilities in Core MIDI's notification system
Constipate NSString keys
Remove "k" from PCMidiConnectionKey
Update .gitignore with top-level DerivedData
Mucking around with PGArc.

Seriously tempted to remove it, and go ARC-only now.
Fixing up the example app to match altered delegate interface
PGMidiSource delegates property declared nonatomic
Layout malarkey and warning removal. No functional change.
NO means NO :-)
Release things appropriately for ARC and non-ARC
ARC fixes
Xcode upgrade check