Changeset 2f8a48f in OpenWorkouts-current for ow/template_helpers.py

(#7) Added several methods to the User model to gather some stats (yearly,

monthly, weekly).

Added two new utilities:

• timedelta_to_hms (so we can print timedelta objects properly in template code)

• get_week_days (returns a list of datetime objects for the days in the same week as a given day)

Added a template_helpers module, containing code that affects template
rendering.

Added timedelta_to_hms as a global to the default template rendering context

Refactored some code in the Workout model so it uses timedelta_to_hms instead
of running the same code twice.