[CDF-396] - CCC - options to better control the size and spacing of cartesian discrete axes bands.
* New cartesian axis options "BandSizeRatio" (defaulted to "panelSizeRatio"), "BandSize" and "BandSpacing".
* JsDocs documentation for all the new options.
* Updated test and site examples.
Merge pull request #137 from dcleao/CDF-396

[CDF-396] - CCC - options to better control the size and spacing of cartesian discrete axes bands.