Switch RawConfigParser -> ConfigParser.

Unsure how to unit test, but I did test it locally.
Merge pull request #106 from jcrobak/config

Switch RawConfigParser -> ConfigParser.
Added an error message when searching for a task that doesn't exist
Made it so that the error button will only show if there was an error
Changed ordering of tasks in the task list to be most recently submitted first (within each grouped list of tasks)
Merge pull request #107 from VisualDNA/error_on_bad_search

Added an error message when searching for a task that doesn't exist
Merge pull request #108 from VisualDNA/display_both_buttons

Made it so that the error button will only show if there was an error on task list
Merge pull request #109 from VisualDNA/order_tasks_by_most_recent

Changed ordering of tasks in the task list to be most recently submitted...
List done tasks in visualizer

List done tasks in visualizer as well as upstream failed and failed.

Show "Dependency graph" button for done tasks

Show "Dependency graph" not "Show error trace" button for done tasks in
task list.
Merge pull request #111 from VisualDNA/list_done_tasks

List done tasks in visualizer
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)