Prepare 3.1 release.
Some bugs are blocking users in 2.stable and the code diverted enough to warrant releasing 3.1 rather than spending time fixing 2.stable. Also, it's been a long time without release and we have some excellent new features (dependency support, el-get-list-packages, etc). The el-get recipe is already refering to the 3.stable branch, that will be created from this commit.
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