* Created source/sae.scad with required dimensions for SAE/Imperial hardware
* Modified source/configuration.scad to use sae.scad
* Generated all STL files using generate-sae-prusa.bat
  * New top level directory of sae-prusa for SAE STL files
  * Not all parts are printed and verified yet
* Also created generate-metric-prusa.bat from generate-metric-prusa.sh
* Changed frame-vertex.scad from using import_stl() to import()
  * According to error message from OpenSCAD 2013.06:
    "DEPRECATED: The import_stl() module will be removed in future releases. Use import() instead."