Added ind and bw_method kwargs to KdePlot
Adds ability to set the bandwidth used for the kde and the indices at which it is evaluated. The first is passed to the bw_method kwarg for scipy.stats.gaussian_kde (for scipy >= 0.11.0); the second is passed to gkde.evaluate. For the case when scipy < 0.11.0 but bw_method is specified, bw_method is ignored (not passed to scipy.stats.gaussian_kde), but a warning is issued to alert the user.

https://github.com/pydata/pandas/issues/4298

looking good....pls add a mention in v0.13.0.txt and doc/source.release.rst (in the 0.13 section)
 great...looks mergable (as soon as we start the 0.13 ones)...@cpcloud?
 @khgitting this looks good, can you rebase on master, then good to go?
 @jreback done. 
 @khgitting can you squash to 1 commit?

(like a rebase, but use 's' on the other commits)
 @jreback Rebased, squashing, on top of a fresh master from fetching upstream. 
 @khgitting thanks!
