Add tests for query error conitions
Add tests for query and conditions
Add tests for query or conditions
Add tests for query not conditions
Add tests for query prefixMatchers
Add tests for query Buffer value matching
lib/query: Wasn't possible to ever hit the Buffer valueMatcher
Use ES5 array methods for hot code optimization and name some unnamed functions
Eliminated dead code path
Support null as input for query.createValueMatcher
Merge pull request #201 from assetgraph/queryCover

AssetGraph.query test coverage improvements