Work in progress for v0.11.4+
Working
Backwards compatibility through conditional compilation.
Working on 0.11
NAN works on both 0.10 and 0.11
Improved NAN.
initial fix WIP
Some fixes.
Fixes
Merge branch 'v0.11' into race_condition
Merge remote-tracking branch 'upstream/master' into race_condition
Cleanup
Merge remote-tracking branch 'upstream/master' into v0.11
Updated NAN and did some touchups.
Removed unused header.
Missing static keyword in ZmqVersion()
Replaced Handle<T> with Local<T>
Merge branch 'race_condition'

Conflicts:
	nan.h
Reverted previous Handle<T> to Local<T> change.
Merge branch 'v0.11'