Don't slow travel moves when enforcing minimal layer time
Merge pull request #16 from CapnBry/master

Don't slow travel moves when enforcing minimal layer time
Update speedFactor name to extrudeSpeedFactor to better reflect what it does after patch #16
Added minimal travel distance for retraction.
Add option to always retract instead of combing
Add a minimal extrusion amount before allowing retraction to avoid flattening the filament.
Add support for using different extruders for support material.
Start in the retracted state, so the first thing added at the skirt is a G1 E0 F{retract_speed}
Fixed #14
Add minimal skirt length to ensure extruder is primed.
Update on Cura support material, use new area based support material.
Fix for no support material and lots of infill in support material.
Update the version number to 13.07
Fix the minimal skirt distance hangup if you do not have a skirt.
Different, better, solution for #18. Added some more UltiGCode flavored things.
Another one for #18, even better.