Added CurrentTime functionality.
tested and working!

time is returned in timestamp format
no need to convert it in cpp. let the client handle it the way he wants (UTC localtime etc..)
Merge branch 'master' of github.com:amitmiran/node-ibapi-addon into amitmiran-master-02

Conflicts:
	examples/basicUsageExample.js
	ibapi.js
Merge branch 'amitmiran-master-02' into async-rateLimiter
Mistake in merge, reverting basicUsageExample to prior commit