this fix is to solve one issue found in lz4 1.2.0, which caused core dump in Spark Core with IBM JDK.  that issue is fixed in lz4 1.3.0 version.

Author: Jihong MA <linlin200605@gmail.com>

Closes #6226 from JihongMA/SPARK-7063-1 and squashes the following commits:

0cca781 [Jihong MA] SPARK-7063
4559ed5 [Jihong MA] SPARK-7063
daa520f [Jihong MA] SPARK-7063 upgrade lz4 jars
71738ee [Jihong MA] Merge remote-tracking branch 'upstream/master'
dfaa971 [Jihong MA] SPARK-7265 minor fix of the content
ace454d [Jihong MA] SPARK-7265 take out PySpark on YARN limitation
9ea0832 [Jihong MA] Merge remote-tracking branch 'upstream/master'
d5bf3f5 [Jihong MA] Merge remote-tracking branch 'upstream/master'
7b842e6 [Jihong MA] Merge remote-tracking branch 'upstream/master'
9c84695 [Jihong MA] SPARK-7265 address review comment
a399aa6 [Jihong MA] SPARK-7265 Improving documentation for Spark SQL Hive support