Merge pull request #41 from madleech/add-3d-raster-to-vector-converter

src/com/t_oster/liblasercut/BlackWhiteRaster.java

src/com/t_oster/liblasercut/LaserCutter.java

src/com/t_oster/liblasercut/Raster3dPart.java

src/com/t_oster/liblasercut/RasterPart.java

src/com/t_oster/liblasercut/RasterizableJobPart.java

src/com/t_oster/liblasercut/drivers/GenericGcodeDriver.java

test/com/t_oster/liblasercut/RasterizableJobPartTest.java