Add vagrant-vbguest plugins recommendation to the README, group optional plugin steps#875

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jeremyfelt merged 2 commits intoVarying-Vagrant-Vagrants:developfrom fabacab:develop

Jun 14, 2016

+10-7

Commits on Apr 15, 2016

Note vagrant-vbguest plugin in the README, as per discussion in Varying-Vagrant-Vagrants#800 .
fabacab
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Group the optional plugin installation steps for ease of reading.
fabacab
committed