Fixed bad ordering when adding nodes from osgjs files
Fixed osgWrapper.Node to add StateSet and UpdateCallbacks before resolving the promise, tests working ok
Merge branch 'develop' into fix_ImportNode
Fixed bad using of promises, Fix to avoid the use of for_each
Fixed failing tests using a lesser strict configuration for jshint
Added unitary testing to check the children order
Make BlendMix work

The constructor was overwritten by the prototype definition
Merge pull request #68 from Teybeo/bug/blend_mix_fix

Make BlendMix work
Merge pull request #67 from jtorresfabra/fix_ImportNode

Fix import node