Add quantified awesome support.

I need quantified awesome support for weekly reviews. The module is
copied from
https://github.com/sachac/quantified/blob/eefc85b/lisp/quantified.el
Added my quantifiedawesome credentials.
Add Sacha Chua's weekly review support.

I have massaged the available code while trying to understand it. There
are small changes to the regexps used to pick up last and next week's
TODO items. Functionally speaking, I tried to be faithful to the
original functionality of the original entry points - but there are no
guarantees.

There is also a small agenda configuration change.
Added three new capture types.

1. Add a quick note to pick up during weekly review
2. Quickly schedule a new item from agenda view
3. Add a note (as a bullet item) in the currently clocked node
Don't use days in clocksum and clean up

Get rid of an unused configuration item:
org-time-stamp-rounding-minutes.
Also change org-time-clocksum-format to remove days.
Make yasnippet config a little more flexible.

Gracefully degrade yasnippet configuration depending on available
packages. Better than the kaboom approach it used previously.
Use when instead of if.

Just picking some nits as usual. :)