Added pc.scene.GraphNode#findByPath and pc.scene.GraphNode#getPath to find a node by its path and also to get said path back. Added test_scene to all tests and updated graph node tests

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branch : feature/node-path
Added setRenderTargetScale to posteffectsqueue
A PostEffectsQueue can have a rendertarget scale which scales the width and height of the internal offscreen buffer
The scale is relative to the canvas size

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branch : feature/posteffects-rendertargetscale
Merge from default

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branch : feature/posteffects-rendertargetscale
Merged in feature/node-path (pull request #72)

Added pc.scene.GraphNode#findByPath and pc.scene.GraphNode#getPath to find a node by its path and also to get said path back.
Merged in feature/posteffects-rendertargetscale (pull request #73)

Add renderTargetScale to PostEffectsQueue
[RELEASE] v0.150.0

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branch : stable
Added tag v0.150.0 for changeset ffc4720104d7

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branch : stable
[VERSION] v0.151.0-dev