Support for colored binary STL

```
What steps will reproduce the problem?
1. Export a binary STL with "keep color" option (i did it with Autodesk
Inventor 2014)
2. load your STL with JSC3D

What is the expected output? What do you see instead?
i expected JSC3D to have an option to render objects using theyr original RGB
color

What version of the product are you using? On what operating system?
1.6.5

Please provide any additional information below.
if you open a binary STL file u will notice that the STL RGB color code is
stored in bytes 1E-20.
These bytes are preceded by "COLOR="

```

Original issue reported on code.google.com by `e.fanz...@gmail.com` on 16 Dec 2014 at 3:35

Start by tracing JSC3D's binary STL loading path and the rendering entry point used after an STL is loaded. Confirm how the COLOR= bytes are interpreted, then determine how original RGB values should reach object rendering; done means a colored binary STL displays its source colors without breaking ordinary STL loading.

Written by the indexing model from the issue text.