Updated readme
Updated readme

Moved API reference to the top, and added updated information about the samples.

RiversideCAPaulD/tableau-test,Jurr32/wdc-test,jpherron/kbwdc,jpherron/kbwdc,Jurr32/wdc-test,tableau/webdataconnector,RiversideCAPaulD/tableau-test,jpherron/kbwdc,RiversideCAPaulD/tableau-test,tableau/webdataconnector,Jurr32/wdc-test