src: make node_isolate global

V8 3.15 has new API functions that let you specify the Isolate. V8 and
node.js generally spend 0.5-3.5% of the time in pthread_getspecific(),
looking up the current Isolate. Avoid that overhead by making "our"
isolate global so we can pass it around. The change to the new API is
introduced in follow-up commits.
src: pass node_isolate to String::Empty
src: pass node_isolate to Integer::New
src: pass node_isolate to Local<>::New
src: pass node_isolate to True() and False()
src: pass node_isolate to Null()
src: pass node_isolate to Undefined()