add support for spark 1.x
fix for python 2.6
include priority and resource information in visualizer
Fix deprecation warning when importing luigi.hdfs.

You will still see a deprecation warning when creating an
HdfsTarget if you haven't specified a config.
Merge pull request #485 from jcrobak/fix-luigi-hdfs-deprecation-warning

Fix deprecation warning when importing luigi.hdfs.
Merge pull request #483 from RUNDSP/spark-1x-job-pr

add support for spark 1.x
Merge pull request #484 from Houzz/viz

include priority and resource information in visualizer
Merge remote-tracking branch 'upstream/master'

Conflicts:
	luigi/scheduler.py
	luigi/static/visualiser/js/visualiserApp.js