Release 0.7.0: Complete material model (anisotropy). Added anisotropy…

… feature to material model and proper parameterization for iridescence. Added tangents precomputation for all meshes. Changed sphere mesh. Changed default texture filtering setting to linear. Changed cubemap build to use clamp wrapping. Added some textures and models.

assets/models/chess/board/board.obj

@@ -0,0 +1,118 @@
+# Blender v2.78 (sub 0) OBJ File: 'chess set.blend'
+# www.blender.org
+mtllib board.mtl
+o board.modified_Plane.001
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+usemtl opengl._board
+s off
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