Fix unit tests

Ensure the home directory is created also inside of FakeFS' chroot.
Remove deprecated directive from gemspec

The has_rdoc directive has been deprecated and is going to be removed
upstream. There's no replacement for it.
Version bump to 0.3.0
Forgot to update Changelog

Add release notes for version 0.3.0
Merge branch 'master' of github.com:flavio/jump