Fixed host IP detection
Changed directory structure to mirror packers directory layout to
simplify merge into packer.
Removed unused code
Imported post-processor-vagrant code from packer.git:v0.5.2-49-gdde91ad

All this code is from courtesy of:
Jason A. Beranek
Jonas Pfenniger
Mark Aaron Shirley
Mitchell Hashimoto
Recai Oktaş
Ross Smith II

See https://github.com/mitchellh/packer/
Imported code for the vagrant post-processor to work with parallels.

The code originate from https://github.com/YungSang/packer-parallels
Fixed buildscript to conform to packers standard naming and added info about using patched post-processor.