Allow for specifying more interpolations (new feature). about recharts

[xile611]

Fixed in version 0.10.5.

Now props type in Curve supports 'basis', 'basisClosed', 'basisOpen', 'linear', 'linearClosed', 'natural', 'monotone', 'step', 'stepBefore' and 'stepAfter'.
Add type can set to be a interpolation function, just like:

import { curveCardinalClosed  } from 'd3-shape';

...
  <Curve type={curveCardinalClosed.tension(1)} points={points} />
...

[kujon]

Thanks a lot! Do you guys fancy Chord Diagram contribution? Something along those lines: http://www.global-migration.info/

[xile611]

PR is welcome! But we haven't think very clear whether such charts which are not very widely used should be contained in Recharts.