Added standard scripts to Makefile

Also cleaned up the following:
  microseconds
  milliseconds
  nanoseconds
  pgp_verify
  pvim
  seconds

userlist: Added licence info

Added doc/userlist.md (from Google+ post)
Merge branch 'master' of github.com:unixnut/scripts
Added COPYING (standard GPLv2 text)

Cleaned up whitespace in Makefile