Added a section about data binding options to the README
Move up check for error status of prepareStatement to before access of info.
Merge pull request #208 from ChannelMeter/fix/preparestatement-error-check

Check the error status of prepareStatement in execute batch
Merge pull request #206 from relops/binding_readme

LGTM - merging.
Added test to illustrate that a float64 pointer fails to marshal
Changed marshal logic that sent float64 pointers to float marshalling.
Merge pull request #209 from phillipCouto/float64_error

float64 point fails to marhsal