Prevent provisioner output from being garbled

Prevent provisioner output from being garbled in the console when
running on Vagrant version 1.2.5 or higher.  Updated monkey patches to
account for changes that were made in Vagrant regarding provisioner log
output.  (These changes should also be safe to use with vagrant 1.2
versions prior to 1.2.5)
Merge pull request #84 from keiths-osc/chef_log_fix

Prevent provisioner output from being garbled