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ARROW-1317: [Python] Attempt to set Hadoop CLASSPATH when using JNI

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #1040 from wesm/ARROW-1317 and squashes the following commits:

274f839c [Wes McKinney] Add note to documentation
1d664b29 [Wes McKinney] If HADOOP_HOME is not set, see if 'hadoop' is in PATH
c6e52d12 [Wes McKinney] Try to set CLASSPATH if HADOOP_HOME is set but classpath is not