Convert tasks to full objects.
Tests for tasks!
Task texts and ids must be non-empty
More tests that we throw on bad attributes.
online tests marked as release only.
Added active_today method on task objects. Refactor display code.
Refernce WS::HRPG::Task for task docs.
Merge branch 'master' into task_obj

Conflicts:
	Changes
Merge branch 'master' into task_obj
Merge branch 'master' into task_obj
Extra debugging for tasks by HRPG_DEBUG
Also show what JSON decoded to.
Attempt to patch GH #27 by skipping null tasks.
Document fix of GH #27 in Changes.
Documentation for WebService::HabitRPG::Task