Merge pull request #16 from tonious/gh-pages

DXF export compatibility fix.
Clean and fix csg.js(used jshint, jslint, yuicompresor):
- removed extra commas
- declared missed variables
- formatted text
- used tabs
It works minified by yuicompresor (from https://github.com/tml/yuicompressor fork which correctly minifies getters and setters)
mega feature - extruding with transformation
updated CSG.extrude method
Formatted text, removed not used variables, fixed leaking variables to global scope.
Merge pull request #18 from tedbeer/gh-pages

Cleaning code, added extruding with transformation
Merge pull request #17 from tonious/gh-pages

Added path related helper functions.