Facet Pivot, histogram widget, and pyramid widget#47

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cassisnaro wants to merge 16 commits intoevolvingweb:masterfrom

Commits on Nov 19, 2013

cambios iniciales
cassisnaro
committed

Commits on Nov 26, 2013

Commits on Dec 11, 2013

Code for facet.pivot added\n TrialPivots implements the code which it can be found in AbstractFaceWidget.js. In Google Chrome looks to work properly
LolaUPF
committed

Commits on Dec 15, 2013

pivots
vvillena
committed
Fixed bug
LolaUPF
committed

Commits on Dec 18, 2013

Commits on Dec 19, 2013