Add call to initCallback to init function.
Add call to initCallback to init function.

This caused an issue for me since i just copied this little sample of code.
Without calling the init callback, it failed with no indication of why.
Hopefully this will help others avoid that.
tableau/webdataconnector,Jurr32/wdc-test,tableau/webdataconnector,jpherron/kbwdc,jpherron/kbwdc,Jurr32/wdc-test,RiversideCAPaulD/tableau-test,Jurr32/wdc-test,RiversideCAPaulD/tableau-test,jpherron/kbwdc,RiversideCAPaulD/tableau-test