Add file logging to margarine for this environment.

Adding logging to a file in this environment (vagrant) so that if errors
do pop up they are much easier to track down.

Issue #12 [1] on margarine-chef has been opened to track this down.  It
looks like an error in logic either in the logging recipe or the
template.

[1] https://github.com/raxsavvy/margarine-chef/issues/12