Resolves issue #43 and updates.

Also updates the Gemfile.lock to reflect the current gems in the
Gemfile.
Resolves Issue #46

This was a local problem with virtualbox. But I added better error
output so the user has an idea of why the failure occurred.
Merge pull request #47 from jameskyle/hotfix/issue-46

Resolves Issue #46
Merge pull request #45 from jameskyle/hotfix/issue-43

Resolves issue #43 and updates.
Merge remote-tracking branch 'upstream/master'