Renamed metadata.json -> .metadata.json

Fixes respec failures with incomplete data in metadata.json.
Rename parameter use_gplextras to install_lzo.
Add rspec tests for Class['cloudera::gplextras'].
Install native LZO libraries to support Hadoop LZO.
Merge branch 'feature/install_lzo' into develop
First draft of README.markdown.

Switching to a new format as documented here:
https://docs.puppetlabs.com/puppet/3/reference/modules_documentation.html
Second pass at README.markdown updates.
Removed all template notes from README.markdown.
Added Cloudera Certified logo to README.markdown.
Third pass at README.markdown updates.
Renamed yumserver and yumpath parameters to repo*.

Added sections to the table of contents.
Added license in README.
Changed name of module in README from 'cloudera' to 'Cloudera Manager'/
Added deprecation warning for yumserver and yumpath.
Include additional defaults for TLS parameters.
Rearrange Usage section of the README.markdown.
More polishing of README.markdown.
Rename parameter use_gplextras to install_lzo.