update the deprecated CountMinSketchMonoid function to TopPctCMS function

http://twitter.github.io/algebird/index.html#com.twitter.algebird.legacy.CountMinSketchMonoid$
The CountMinSketchMonoid has been deprecated since 0.8.1. Newer code should use TopPctCMS.monoid().

![image](https://cloud.githubusercontent.com/assets/1327396/7269619/d8b48b92-e8d5-11e4-8902-087f630e6308.png)

Author: KeheCAI <caikehe@gmail.com>

Closes #5629 from caikehe/master and squashes the following commits:

e8aa06f [KeheCAI] update algebird-core to version 0.9.0 from 0.8.1
5653351 [KeheCAI] change scala code style
4c0dfd1 [KeheCAI] update the deprecated CountMinSketchMonoid function to TopPctCMS function