Update makefile to include help documentation for wipe, and to sanity check
environmental variables.
Added "package" to Makefile help.
Fixed parameter strings in Makefile sanity check.
Move sanity check to individual files.
Fixed Makefile sanity checking to work for all command line argument
variants.
Removed confirmation messages.
Merge pull request #375 from kubark42/makefile-sanity-check

Update makefile to sanity check environmental variables.