shader files extension was changed:
vertex -> vsh
fragment -> fsh
simple vertex shader for rendering canvas plane
two-pass gaussian blurring fragment shader
simple additive blending fragment shader
.gitignore updated
full-document mode.
new shader files were added
glowing attribute was moved to material.
SurfaceMaterial was renamed to SolidMaterial
resource name parsing fixed
new framebuffer abstraction.
new functions for work with frames, textures and viewport in WebGlContext
new drawable abstraction.
new drawable class for rendering full-screen canvas plane/
rendering flags enum
new post-processing filtering feature.
refactored:
  new Renderer abstraction,
  Camera now independent of Scene,
  new "scene" subfolder