make NanAsyncWorker.*Persistent() public
NanNewLocal<T>(Handle<T>) for Local<T>::New(...)
Merge pull request #41 from rvagg/0.5.2-wip

0.5.2-wip: make NanAsyncWorker.*Persistent() public
@0.5.2
NanNewHandle only uses isolate for Node 0.11.9+
NanNewLocal<T>(Handle<T>) for Local<T>::New(...)
NanNewHandle only uses isolate for Node 0.11.9+
Merge branch '0.6.0-wip' of github.com:rvagg/nan into 0.6.0-wip

Conflicts:
	nan.h
merge