Adding a preliminary copy of the sign and push script for the HEAD commit
Integrated the script into the sign command. Currently this relies on the script being in the repo's root. We would need to hard char * the script into sign.c. But as this is a temporary solution this is acceptable
added comments and a little error check for the script execution
Adding a reference to a script instead of a hard coded char*
Merging changes to builtin/sign.c
Renamed and reorganized sign.c to crypto-interface.c to be more versatile.
Merging in the changes from bashSign