[#feature/warning-matrices] Fixes some warnings and improves minor stuffs
Merge pull request #45 from cedricpinson/feature/warning-matrices

[#feature/warning-matrices] Fixes some warnings and improves minor stuffs
Changes all Object with keys inside as a new Map object
Renames method getMap to getMapContent
Fixes vertex color

Also refactore RenderBin to make is simpler, adjust the grunt file to
support watch