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.