Start fix for tranformer return shape

[ivirshup]

Fixes #73

Still needs a test, but I can add that tomorrow.

I've also reversed the dimensions specified by the .transform docs since a) I'm using the indices as they're returned and b) it fits the API of KNeighborsTransformer this way.

[lmcinnes]

Thanks, this looks promising. The whole KNeighborsTransformer thing has been in flux for quite a while so I wasn't paying too much attention, but it looks like it is almost ready to get merged so I guess it is time to make sure this meets the same API and does things right.

[ivirshup]

I think that should do it.

Related question, should the default settings be the same between NNDescent and PyNNDescentTransformer?

[coveralls]

Pull Request Test Coverage Report for Build 103

• 15 of 15 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 85.095%

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Totals
Change from base Build 100:	0.2%
Covered Lines:	2061
Relevant Lines:	2422

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💛 - Coveralls

[lmcinnes]

Thanks.

As for defaults being the same -- ideally. I believe there was some changes to the defaults for NNDescent, and those potentially never got migrated to the Transformer.