Add opensciencemap vectiles#4

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hkrishna wants to merge 7 commits intomasterfrom

add-opensciencemap-vectiles

Commits on Jan 28, 2014

add support for OpenScienceMap formatted binary tiles to VecTiles provider
bcamper
committed

Commits on Jan 30, 2014

Commits on Feb 3, 2014

adding OsciMap4 to the packages array
hkrishna
committed

Commits on Apr 8, 2014

VecTiles: increase max zoom supported for pixel tolerances
bcamper
committed
VecTiles: add support to pad tile bounding box by a specified amount(used by OpenScienceMap to hide seams between tiles)
bcamper
committed