Move eigen dl version to single file, update to 3.3.2 #614
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This moves the eigen download version and extraction path to a single file (.eigen-build-version), loaded by both the appveyor and travis-ci scripts.
It also updates the eigen version from 3.3.0 to the latest 3.3.2.
Finally it saves (a tiny amount of) storage use on the travis-ci builds by extracting the .tar.bz2 on the fly rather than downloading first then decompressing the saved file. (It also saves slightly on download bandwidth by downloading the source tar.bz2 instead of the tar.gz).