Add Git dependency to plugin
Fix plugin install

The `test` command in the `onlyif` and `unless` directives needs a
specified path.
Add Git dependency to build
Add build-essential dependency to build
Enforce explicit path to rbenv in build execs
Set $RBENV_ROOT in relevant build execs

Exec commands are run in subshells, so exported variables are not
persistent. Therefore, environment variables must be explicitly set when
needed.
Update dependencies for build
Ensure build-essential is installed in build test
Remove external dependencies from build

The `rbenv` module probably shouldn't be responsible for declaring
external dependencies, despite [this commit][1]. The manner in which
these dependencies are managed should be at the user's discretion.

[1]: http://git.io/Zm39Og
Enable CFLAGS to be configurable for build
Updated rbenv::build, rbenv:gem. Release 0.2.0 Fixes #2 #4
* removed all external dependencies (git, etc)
* add new cflags parameter (thanks to @thaumazein)
* updated all tests so they pass with Vagrantfile
Update CONTRIBUTORS.md
Update README.md
Update README.md

Added note about additional packages needed to install ruby effectively.
change default group ownership to adm, release 0.2.1
remove require Rbenv::Build from gem install Fixes #10, release v0.2.2
move parameters from rbenv::params to rbenv to better support Puppet 3 + Hiera
update tests to use latest ruby 1.9
update Vagrantfile to use v2 config
bump release to v0.2.3