Summary:
Instead of replacing the tilde with home-dirs on an incomplete, ad-hoc
basis, let's use a package for this. It also supports `~USER` resolution
which someone might reasonbly expect to work if `~/DIR` is working.
Reviewed By: jknoxville
Differential Revision: D13940956
fbshipit-source-id: 5bfa9b8b2540fed8c05c856ff736e48e925f985d