Fix error in 'bar' example

- Error message:"Uncaught TypeError: Object function h(a){return e(a)} has no method 'rangeBand'"
- Patch: Replace 'Figure' with 'PandasFigure'
Merge pull request #53 from e9t/master

Fix error in 'bar' example
added an example with two lines
Merge branch 'master' of github.com:mikedewar/d3py
removed some commented out lines from the examples
merge