Fix compatibility with recent Node versions#63

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Vortex375 wants to merge 5 commits intonikhilm:masterfrom

Vortex375:v8-compat

Commits on Mar 17, 2016

begin rework for compatibility with new v8 APIs
Benjamin Schmitz
committed

Commits on Mar 18, 2016

redo; and use the nan compatibility layer
Benjamin Schmitz
committed
fix compile
Benjamin Schmitz
committed
fix undefined symbol
Benjamin Schmitz
committed

Commits on Mar 24, 2016

properly dispose of callback
Benjamin Schmitz
committed