Implementer financial barhart. (“barcharts: true” option for candle chart)
Fix for xScale
Added examples for financial bar chart
Add candle barchart to the displayed examples.
Build examples.

* build the examples with the new candle barcharts
* barchart test now failing.
Build and update reference.

* build the flotr2 core libraries
* update spec reference implementation with new barcharts.
Merged with flotr2/master