Tilequeue

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* Eliminate extra slash in S3 filename. [Issue](https://github.com/mapzen/tilequeue/pull/65).
* Update `make_queue` signature to support sending items to the queue for rendering when a request for a tile which hasn't been rendered before is received. [Issue](https://github.com/mapzen/tilequeue/pull/66) as part of [larger issue](https://github.com/mapzen/tile-tasks/issues/39).

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* WOF neighbourhoods with inception and cessation dates are now respected, with those features being hidden from tiles. [Issue](https://github.com/mapzen/tilequeue/issues/59).
* The WOF update process is now robust to intermittent HTTP errors. This could help if you've been experiencing occasional WOF update failures. [Issue](https://github.com/mapzen/vector-datasource/tilequeue/60).

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* Made the WOF processor robust to missing `lbl:longitude` and `lbl:latitude` properties by falling back to the geometry's position. This isn't as good as the label position, but better than erroring.

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* Added a date prefix to be used to distinguish between different versions of the tiles in the store. This means it's not necessary to create a new bucket for each release.
* Added a hash prefix for files stored in an S3 bucket. This is recommended practice for distributing load for a bucket across an S3 cluster.

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* Move reproject_lnglat_to_mercator function for outside usage

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* Configure better defaults in sample config
* Add WOF neighbourhood processing
- add command to load initial neighbourhoods to database
- add command to track updates
* Create abstraction to factor out threaded enqueueing