Allow tasks to be sorted by name

[Ember-Dawn]

Problem

• Projects can be sorted by name.
• Tasks do not appear to have an equivalent name-based sorting option.
• Task lists and dropdowns become difficult to navigate when a project has many tasks.

Requested feature

• Add an option to sort tasks by name.
• Support:
  • Name ascending
  • Name descending

Expected behavior

• Apply the selected order consistently in task lists and task dropdowns.
• Keep the current ordering available as the default or as a separate option.
• Use case-insensitive alphabetical sorting.