Added in Rake Tasks, And Mailers

Added mailer for weekly email alerts, as well as rake tasks to populate tasklist with
reoccuring tasks that happen each week, month, and year.
Rake tasks work via Whenever Gem, populating local crontab with rake tasks.
There is a rake task for each controller (Weeks, Months, Years) to populate each
respective table with weekly, monthly, and yearly tasks that need to be checked off.

Need to add in paginate support to clean up visualy, paging off each list by week. So that
each page will be a full weeks worth of items.

Plans for the future include search functionality, jQuery Calendar to list items by
week/date, Angular filtering mechanism(?) to sort by completed/not-completed and completed
by which user, Splitting tasklist into different lists based on category (Networking,
Facilities, Administration, Dev/Ops, etc...), and probably many more once app
demonstration occurs.

Signed-off-by: "Jake Champlin" <jchamplin@thedatacave.com>