Integration 1

[hkrishna]

Has the following branches:

1. dryer-tilestache Dry tilestache #1
2. better-error-responses Better error responses #5
3. add-opensciencemap-vectiles Add opensciencemap vectiles #4
4. add-mapbox-vectiles Add mapbox vectiles #7
5. add-layer-name-to-vtm-tiles adding layer_name to features in the opensciencemap vtm tile #8
6. drop-null-val-prop Drop null valued properties #9
7. extend-multiprovider Extending multiprovider  #3
8. update-column-names update strategy for getting column names #12
9. empty-mapbox-responses default to an empty string for mapbox layer names #13
10. empty-oscimap-responses default to empty string for oscimap too #14
11. performance-updates Performance updates #16
12. vtm-update-heights vtm formatter expects integer heights, * 100 #17
13. remove-sort Remove feature sort by id #18
14. mapbox-content-type Update mapbox content type response header #21
15. vtm-add-geometry-type Add geometry_type to vtm response #27

[bcamper]

@hkrishna, this branch appears to be missing at least the following commits, which are needed to avoid seams between tiles in OSciMap tiles:

35123fd
2186f35

[nvkelso]

This high level view of the delta between mainline TileStache and Mapzen's fork is still interesting, but is out of date.