Avoid getParent calls in bboxQuery().

Deal directly with the cellids.

Closes #74.
Merge pull request #75 from mapbox/issue74

Avoid getParent calls in bboxQuery().
Add more tests for pm-crossing lines.

Note that lines on tile boundaries are a different beast.

Also use a consistent offset in forming queries around 0/0.

Closes #54.

Add bounds from example in #54.
Merge pull request #76 from mapbox/issue54

Add more tests for pm-crossing lines.
Add a test for queries near -90/0.

Currently we're relying on query filters whenever the zoom level of
the query's enclosing tile > 0.

Question is do we generalize the query splitting to zoom levels
greater than 0?
remove unused deps
Merge pull request #78 from mapbox/remove_deps

remove unused deps
0.7.2
bumb dyno. new return values and throughput throttling
Merge pull request #79 from mapbox/new-dyno

New dyno return values and throughput throttling
v0.7.3
accept feature collection for cardboard.put
check for existance of items that are being updated, fail early if not found
update tests.
Merge pull request #51 from mapbox/accept_featurecollections

accept feature collections
0.8.0
IPython Notebook and supporting script.
Merge pull request #81 from mapbox/issue80

IPython Notebook and supporting script.
Add tests of queries across the dateline.