flagutil: simple utility types for common flag tasks

Currently only handles the bool->string flag alias.
dbg: simple debugging message package
Merge pull request #2 from cookieo9/flagutil

flagutil: simple utility typs for common flag aliasing
dbg: added simple documentation
Merge pull request #3 from cookieo9/dbg

dbg: simple debugging message package
Merge branch 'master' of https://github.com/cookieo9/go-misc into maps

This adds the dbg and flagutil packages.