Added exploit-exercises/nebula challenge scripts.
Created script to setup special shell program (levelXX).
Removed unfinished level nineteen.
Added exploit-exercises/nebula level06.
Added exploit-exercises/nebula level14.
Added exploit-exercises/nebula level17.
levelXX.tar.gz was never a *.tar.gz rather a lowly *.tar.
Added prelims for exploit-exercises/nebula level15 (get, parse and setup dev env).
Fixed a bug and cleaned up C code.
POSIX compliant.
Minor fixes (made it work again).
Merge branch 'master' of https://github.com/sacko87/h4x0r