text: Title: Intercluster Distance Map (MDS)
  Body: **Describe the solution you'd like**
  Create a cluster visualization that displays the distance between cluster centers and cluster relative sizes by using [multidimensional scaling (MDS)](http://scikit-learn.org/stable/modules/generated/sklearn.manifold.MDS.html). The visualization would be:
  
  1. A scatter plot whose points would be described by the MDS embedding of the cluster centers 
  2. Each point would be sized according to the number of instances belonging tot he cluster. 
  3. Each point would be labeled with its cluster index 
  
  **Is your feature request related to a problem? Please describe.**
  Between this and #570, Yellowbrick could provide a reasonable approximation of PyLDAViz in an interactive notebook with ipywidgets. 
  
  **Examples**
  
  <img width="590" alt="screenshot 2018-08-21 06 55 38" src="https://user-images.githubusercontent.com/745966/44397681-39f12e80-a50f-11e8-88b8-53a76bbaa1ab.png">
  
  