* Add Python API document for CM 4.7.0
   - 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