Add Vagrant file permissions. Fix #20
Prefer stable composer packages. Fix 21
Add APC & PHP-CLI to Vagrant. Fix #24
Merge pull request #21 from janisto/patch-1

Add Vagrant file permissions. Fix #20
Merge pull request #23 from janisto/patch-2

Prefer stable composer packages. Fix #22
Merge pull request #25 from janisto/patch-3

Add APC & PHP-CLI to Vagrant. Fix #24