Modified index for running task section
Modified luigi.js
Implemented running tasks, but also implemented done tasks
Removed the done list, so now just has running list
Made it so dependency graph button shows instead of error button (would be nice to have both really for all tasks)
Added an error message when searching for a task that doesn't exist
Merge remote-tracking branch 'visualdna-external/1-task-list' into visualdna_hackday_2013-06-19

Conflicts:
	luigi/static/visualiser/index.html
	luigi/static/visualiser/js/visualiserApp.js
Merge remote-tracking branch 'visualdna-external/error_on_bad_search' into visualdna_hackday_2013-06-19