Fixed SFTP not working

sftp-server isn't located under `/usr/libexec/` (the directory doesn't exist). It's instead located at `/usr/lib/sftp-server`
Merge pull request #2 from jorisvddonk/patch-1

Fixed SFTP not working
Release version 0.9.2
Fix typo in README
Add license
Fix compatibility with latest Ubuntu 12.04 base image.
Allow running scripts during startup.
Bump version to 0.9.3
Do not save SSH host key in baseimage-docker. Instead, generate it automatically during boot.
Correctly mount passenger-docker in Vagrantfile
Add forgotten file
Note release date for 0.9.3
Add a Changelog entry documenting the SSH host key change
Add table of contents to README.
Update README
Update README
Add unit tests
Run tests on release
Fixed syslog-ng startup problem
Bump version to 0.9.4