Uses rpaths everywhere in reprozip
Uses rpaths everywhere in reprounzip
Uses rpaths in tests/run.py
Uses rpaths in reprounzip-vagrant
Don't use chroot without use_chroot
Untar intermediate directories with vagrant

Lists directories on the TAR command-line to unpack them with their
correct permissions.
Fixes two bugs with vagrant without chroot
Makes Travis get the latest rpaths from Github
Fixes some more Path bugs
Fixes an issue on Travis

This was only reached when PATH contained relative paths.
Factors get_string() in C code
Passes binary and databasepath through get_string

This allows bytes to be passed in on Python 3.
Adds unicode_ for Python 3 compatibility
Adds encoding='utf-8' to open() calls

I added this to rpaths 0.3 and it's great.
Fixes more unicode/bytes problems
Correctly packs intermediate symlinks