Migrate attribute value changes logic to a two levels Map.#1763

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thibaultzanini wants to merge 2 commits intomontagejs:masterfrom

thibaultzanini:attributes-values-2-maps

Commits on Sep 10, 2016

Migrate attribute value changes logic to a two levels Map.
thibaultzanini
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Commits on Sep 19, 2016

Set private setElementAttributeValue and getElementAttributeValue methods.
thibaultzanini
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