WebGL errors in some examples

[tsherif]

The following examples produce WebGL errors while running:

http://scenejs.org/examples/index.html#styles_lineWidth http://scenejs.org/examples/index.html#texture_normal http://scenejs.org/examples/index.html#texture_normal_reflect http://scenejs.org/examples/index.html#texture_procedural_color_grid http://scenejs.org/examples/index.html#reflections_withSpecularMap http://scenejs.org/examples/index.html#postprocessing_depthOfField_autofocus_grid http://scenejs.org/examples/index.html#postprocessing_scanlinesAndSepia

[xeolabs]

Error in http://scenejs.org/examples/index.html#postprocessing_depthOfField_autofocus_grid could be a texture feed back loop - see https://github.com/jbouny/ocean/issues/7