.fixture() -> .maps()
add .fixture(name) -- loads a fixture
add .mapper(mapper)
query: add query(key, value) tests
query(): add key, value implementation
.query(): add key, value, parse tests
.query(): add .query(key, value, parse) implementation
Merge pull request #20 from segmentio/query

Query
.end(): return an error if the method is not implemented
.end(): throw if no request was created
.end(): dont throw when no requests are created for now
add .channels(arr) assertion
add .option(name, meta)
allow chaining with .option(), .channels()
add .requires()
.channels(): sort to remove annoying errors