Extruder Masta - postprocess for kisslicer

##----New realase------
http://www.thingiverse.com/thing:710309
##----New realase------

Bowden printing at high speed causes lack of beads and threads.

To care for a smooth build and release the pressure in the head.
Useful for printing using a bowden.
Allows you to slowly build up the pressure.
Before the end of the working path gradually releases it.
Result
At the start of the path, no gaps or holes in the material from the lack of plastic.

Has options for precompress and postrelease of filament for good print at high speed printing.

It modulate the speed of movement of the head.
This is not the same as the acceleration !!

:)

https://www.youtube.com/watch?v=q1uyDekTJ7o

###141201

• add springiness value in return of ahead and tail to automaticly calculate over shoot
  in a relationship of speed
  try --help arg

###141129

• fix tail subdivision

###141124 2219

• read settings from args line :)
  for example
  ./em.py --ds=20.00 --fs=20.00 --de=25.00 --fe=20.00 --ahead=0.2 --tail=0.3

###version 141124_1104

• fix for one point work path ( yes kiss generate it :P )
• add tail option to define release amount at end of working path
• add logic for dropping feed rate if no needed
• add some args parsing --help :)