Upgrade to rvm 1.18.15

* Adds ruby-1.9.3-p392 & ruby-2.0.0-p0
Default rvm ruby to 1.9.3-p392
Update README for soloist 1.0
Add myself as a maintainer.
Upgrade Hombrew and Use `brew` definition directly

* Remove brew_install completely
* Latest homebrew was needed to get solr,svn & zsh recipes to work
Merge pull request #239 from hiremaga/prefer_brew_to_brew_install

Upgrade Hombrew and Use `brew` definition directly
Merge pull request #236 from hiremaga/soloist-1.0

Update README for soloist 1.0
Merge pull request #235 from hiremaga/rvm-1.18.15

RVM 1.18.15 and Ruby 1.9.3-p392
Add Chrome Canary