Add Python API document for CM 4.7.0

[jazzwang]

• currently only 5.0.0 API shown at http://cloudera.github.io/cm_api/epydoc/5.0.0/index.html
• this API document is for CDH 4.7+ http://cloudera.github.io/cm_api/epydoc/4.7.0/index.html

[philipl]

4.7 epydocs are now available. Thanks!