fix broken in link in python docs

Author: Andy Konwinski <andykonwinski@gmail.com>

Closes #650 from andyk/python-docs-link-fix and squashes the following commits:

a1f9d51 [Andy Konwinski] fix broken in link in python docs
(cherry picked from commit c05d11bb307eaba40c5669da2d374c28debaa55a)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>
Add Python includes to path before depickling broadcast values

This fixes https://issues.apache.org/jira/browse/SPARK-1731 by adding the Python includes to the PYTHONPATH before depickling the broadcast values

@airhorns

Author: Bouke van der Bijl <boukevanderbijl@gmail.com>

Closes #656 from bouk/python-includes-before-broadcast and squashes the following commits:

7b0dfe4 [Bouke van der Bijl] Add Python includes to path before depickling broadcast values
(cherry picked from commit 3776f2f283842543ff766398292532c6e94221cc)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>