Adds ptrace to unhandled dangerous syscalls
Adds a bunch of other syscalls
Adds quickstart section to README
Fixes crash on faccessat()
'pack' warns and continues on missing file
Do not attempt to pack files from /proc or /dev
Vagrant setup no longer lists files not in pack

When writing the setup.sh script for Vagrant (without chroot), check
that each file exists in the pack.
Do not overwrite files with vagrant without chroot

This just breaks the VM.
Another day, another tar bug
Downloads busybox instead of copying /bin/sh
Fix
Fixes testrun table
Adds shebang to tests/run.py
Packs the dynamic linkers
Tracer respects order between exec/opened files

Previously, a file that was opened and executed would always be handled
as if it had been executed first and opened second, no matter the
timestamps.
Fixes pytracer fork child returning

If the tracer can't find the command to execute (execvp returns), abort
via exit() so the Python process doesn't carry on duplicated and tracing
itself.
Merge branch 'pack-linkers' into 'master'

Conflicts:
	reprozip/reprozip/tracer/trace.py
Merge branch 'use-busybox' into 'master'
Updates URLs (reprozip-ptrace -> reprozip)
Comments directories as such in config

Their size would probably be shown, e.g. "/home # 4 KB".