Merge pull request #9 from apaprocki/master

Update BLPAPI to 3.6.3.1 (Linux/Windows), 3.6.2.1 (OS X)
Add 'authenticationOptions' to Session options.

Adds support for specifying authentication options within Session
options. Adds 'authorize()' function on Session which takes care
of sending the authorization request after an authentication
service is opened successfully. Added example which shows how to
use options.
Use String::Utf8Value or String::AsciiValue.
Merge pull request #11 from apaprocki/authentication

Add 'authenticationOptions' to Session options.
Update Persistent::New to pass Isolate.
Fixed OSX libblpapi3_*.so install names.

The existing libraries did not properly prepend @rpath/ to the
install name of the library, so the linked node module could not
find the shared objects when loaded at runtime.
Update to v0.1.5.