Add tooltips with parameters to dependency graph.

Display only task name on the dependency graph.
Merge pull request #115 from VisualDNA/tooltips_for_graph

Add tooltips with parameters to dependency graph.
Added WorkerSchedulerFactory to interface.py to make worker/scheduler customization more complete and easier to integrate
Make default_from_config less strict.

If the section/name specified in default_from_config isn't found,
then has_default returns False. This makes default_from_config
easier to use in tests or if you are trying to run an unrelated
Task.
Merge pull request #116 from dj4b1n/master

Added WorkerSchedulerFactory to interface.py to make worker/scheduler customization more complete and easier to integrate
Merge pull request #117 from jcrobak/nicer-default-from-config

Make default_from_config less strict.
Adding support to the HDFS module for the Apache 1.x release of Hadoop and fixing tests of that module which were failing
Merge pull request #118 from gf-atebbe/master

Add Apache 1.x HDFS support
Task history, implementation of https://github.com/spotify/luigi/issues/51

All the tables are added as per the RFC, though currently
only Task, TaskEvent, and TaskParameters is being used right now.

Task history is added by the scheduler, history viewer
available through /history/
[job conf] add support for job queue parameter (for Capacity Scheduler)
Merge pull request #120 from kawaa/master

[job conf] add support for job queue parameter (Capacity Scheduler)
Updating code to run in both CHD3/4 and Hortonworks current releases

hadoop fs -ls -d is not compatible with releases other than CDH4. This update should work in all versions.
Updating code to run in both CHD3/4 and Hortonworks current releases

Updated code after the review
[hadoop scheduler] switching between schedulers using hadoop_scheduler config parameter
Merge branch 'master' of git://github.com/kawaa/luigi into kawaa-master

Conflicts:
	luigi/hadoop.py
	luigi/hive.py
Merge pull request #127 from erikbern/queue-pool

[hadoop scheduler] switching between schedulers using hadoop_scheduler config parameter Edit
Support optional serialize() method on Parameter
Merge pull request #129 from erikbern/serialize-params

Support optional serialize() method on Parameter
fix LocalFileSystem.isdir
Merge branch 'task_history' of git://github.com/JoeEnnever/luigi into JoeEnnever-task_history

Conflicts:
	test/customized_run_test.py