[HOTFIX] SPARK-1399: remove outdated comments

as the original PR was merged before this mistake is found....fix here,

Sorry about that @pwendell, @andrewor14, I will be more careful next time

Author: CodingCat <zhunansjtu@gmail.com>

Closes #474 from CodingCat/hotfix_1399 and squashes the following commits:

f3a8ba9 [CodingCat] move outdated comments
[SPARK-1560]: Updated Pyrolite Dependency to be Java 6 compatible

Changed the Pyrolite dependency to a build which targets Java 6.

Author: Ahir Reddy <ahirreddy@gmail.com>

Closes #479 from ahirreddy/java6-pyrolite and squashes the following commits:

8ea25d3 [Ahir Reddy] Updated maven build to use java 6 compatible pyrolite
dabc703 [Ahir Reddy] Updated Pyrolite dependency to be Java 6 compatible