Added indexes for installed packages
Refactored searches into a set of client wrappers

sous_chef.chef.Chef no longer handles injecting keys into searches, this
is now done by the partial_search_nodes function in blueprints.py
Removed overly specific partial_search_node function

Replaced with a single_row function that extracts one item from an
iterable of results.
Moved all templates into subfolders and renamed to {index,view,macros}.html
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