#23 Error checking broken

[Michael Chase-Salerno]

mksiimage doesn't seem to fail when the --location
directory doesn't exist. I think some if not all of the
return values in Package.pm are wrong if nothing
footprints. These should be fixed and we should also
check for the existance of the directory.

[Michael Chase-Salerno]

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Added a check for the package path and fixed some return values.