TST: speed up travis builds with containers and wheel caching #220
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Inspired by the speedups achieved in rasterio, these changes run the Travis builds on the new container-based infrastructure and build wheels for the dependencies. The wheels are cached so that subsequent builds will be much faster.
With the addition of libspatialindex-dev to the travis apt package whitelist, all of the system deps are available in the containers.
Pandas master still requires a build but the pandas stable releases use pypi and build cacheable wheels.
After the initial build, I'm seeing travis runs completing 2-4x faster.
Resolves #125