Update README.md

Bundle raises a warning when executed with sudo. 

Don't run Bundler as root. Bundler can ask for sudo if it is needed, and
installing your bundle as root will break this application for all non-root
users on this machine.
Merge pull request #51 from diasjorge/patch-1

Update README.md
Bump various cookbooks
- osx is not in its own repo
- sprout-osx-apps uses homebrew_cask LWRP
- run sprout-homebrew early for recipes that assume cask is installed
Remove references to sprout-pivotal

- sprout-pivotal is now in the attic
- as a consequence site-cookbooks are no longer needed
Copy over info from sprout repo README

Since the sprout repo is about to turn into the sprout-osx-apps repo
sprout-osx-apps is now a top-level repo
No need to run foodcritic since this repo does not contain cookbooks
avoid output timeout during softwareupdate during converge
flip travis_wait and sudo to see if that helps
Replace MIT license with unlicense
With latest homebrew
Adding libxml2 via homebrew to soloistrc