Welcome Jeff Eastman as Mahout Committer

[Grant Ingersoll]

It is my pleasure to welcome Jeff Eastman as a committer to the Mahout  
project on behalf of the Lucene PMC.  Jeff has already made a number  
of nice contributions to the Mahout code base and has shown a penchant  
for working well in the Mahout community.

Congratulations, Jeff and welcome aboard!
-Grant