Fix hit plugin with stacked lines
Use a dedicated member in each point array for the stack offset

See https://github.com/HumbleSoftware/Flotr2/pull/256
Merge pull request #256 from ioguix/hit_stacked_lines

Fix hit plugin with stacked lines
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.
Merge remote-tracking branch 'upstream/master' into create-umd-by-default