Renamed all 'context' to 'solution' and aliased it in the Navigator API.

Closes #31.
Moved from " to '.
Renamed join in search.
Updated the example to the new 'search' API.
Added SauceLab support through Zuul.
SauceLab Browser Matrix
Moved travis badge to the top of the README.
Added code coverage with istanbul and coveralls.
README fixes.
created a helper function for initializing a 'db' instance.

added another argument to the constructor that is a callback for when the indexDB onStoreReady state/function is called.

also made the constructor work if there are only 2 arguments and one of them is supposed to be the 3rd argument callback function.
Added basic filtering for get() and getStream().
Added filtering support in each search condition.
Moved matcher function to utilities.
Added async solutions filtering.
Added docs for filtering.
Added negation example for filtering.
markdown fixes.
Merge pull request #47 from mcollina/filtering

Filtering support
Added unit tests and general polish.
Merge branch 'boxxxie-master' into v0.7-wip

Conflicts:
	lib/levelgraph.js
	package.json
	test/triple_store_spec.js