Travis: cache pip and compiled libgeos binaries #248
Merged
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This enables caching of pip wheels and libgeos compiled binaries. It should speed up build times for Travis-CI testing.
After the cache is built, most of the instances will build in less than 2 minutes. The first time compiling it may take 6-15 minutes per instance. On "nightly" libGEOS will always build from source, not sure what pip. It should run about 10 minutes.
Times: first build versus already cached
Set "middle of the road" configuration to numpy=1.9.3. A more flexible configuration caused too many problems in testing. If you know a more maintainable way to do this, please submit a PR.
Cache stored is 670 MiB.
"nightly" will fail until PR #246 is merged.