Create templates/components directory in blueprint.
Merge pull request #761 from rjackson/blueprint-templates/components

Create templates/components directory in blueprint.
Show detailed rebuild timing information.

Uses the same logging as Broccoli itself. By default it logs any trees
that took greater than 5% of the total build time.

Also, we now print `Built Successfully - XXXms.` for each rebuild to
assist in tracking down performance issues. We may decide to remove the
more verbose logging at a later time once things are better understood
(and we have near constant time rebuilds).