Added dependency check

gcc is required to compile the new bash, an it may not be installed on all system.
Added system check before downloading files to check for gcc to be installed.
Update fixbash
Update build example for Patch 28
Merge pull request #30 from tuxpowered/master

Added dependency check
Merge pull request #31 from philrandal/master

Update build example for Patch 28
Merge branch 'master' of https://github.com/mhensler/shellshocker

Conflicts:
	index.html
Added patch 29