Mpl bubbles

alright, mpl-bubbles are in. also, look at this clean PR with all the ordering. i think this is going to save us a bunch of headaches `conflict-wise` (notice, only additions!).
"Matplotlib Bubble Chart with <code>edgecolor</code>, <code>linewidth</code><br>and Opacity Dimensions"
![](http://new.tinygrab.com/c751bc2ee21476b01aef606fac39e252b71f5c62c0.png)