updating vagrant deploy to fix epel version, tower install process to la...

...test and a quick fix to docs so I could include landrush and dns endpoint for browser access

Couple of major details: 

* thought I'd help with docs pointing to prereqs and optionally fold in landrush so the endpoint doesn't require a static ip locally
* needed to fix reference to epel repo rpm b/c 7.1 disappeared and was breaking the standup process
* changed the download and unpackage process for Tower to decompress any package with the current folder structure (version independent) and point the default download to 'latest' instead of specific version [2.0.4 was replaced with 2.0.5 and broke the buildout process]

Hopefully this helps... was awesome to leverage this to base another solution off of, so I thought I'd commit/PR/contribute this back.