Customizable attribute value display#159

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tfe wants to merge 2 commits intoupmin:masterfrom

tfe:attribute-display-values-for-upstream

Commits on Feb 4, 2015

Add Upmin::AttributeValue class so that we can render values for display using different partials than the normal attribute partial (which usually has form elements).
tfe
committed
Render AttributeValues rather than raw attributes where applicable, specifically in search results.
tfe
committed