Update rz_broker support for metadata.

The razor module chef support changed the data format. Server and
version attribute for rz_broker are now part of the resource metadata.
Also we never properly supported servers, only a single server. This
commit fixes #93.
Merge pull request #94 from nanliu/tb/broker

Update rz_broker support for new metadata style.
Update README to reflect additional resources.

* Update readme file to include additional rz_* resources.
* Update readme to note resources only add/remove, not manage.
* Fix markdown resource example to display properly.
Merge pull request #95 from nanliu/tb/readme

Update README to reflect additional resources.
Add support for installing Razor using OS packages

This introduces support for installing Razor using OS packages, along-side the
existing support for installing from git.  At the moment git remains the
default mechanism for installation, as we gradually move toward a more
standard release model.

Closes #91.

Signed-off-by: Daniel Pittman <daniel@rimspace.net>