Bi provider stuart changes#235

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stuartlynn wants to merge 7 commits intomasterfrom

bi_provider_stuart_changes

Commits on Nov 3, 2015

adding a filterable json provider.
stuartlynn
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Adding the ability for leafletLayer to filter data on the client side and to calculate histograms and value arrays for the variables stored in the currently loaded tiles.
stuartlynn
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Examples of the filters and histogram api working
stuartlynn
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