Merge pull request #1 from gioper86/master

Adding horizontal cursor
Merge pull request #2 from gioper86/master

Fixing some problems with SVG elements selection
Merge pull request #3 from gioper86/master

Fixing some bugs
Merge branch 'multi-chart' of https://github.com/gioper86/nvd3-exbar
properly dealing with having sparse null values.
Drawing continues lines and areas was not working
When setting a limitY part of the path beyond that limit was still visible
Increased version to 0.0.2 and generated new compiled files
Fixing the limitY problem in a different way.