* Pull down binaries for binaryen (instead of building)
* Try x86 version
* Skeip build deps
* Try with a "stable" version?
* Extend crypto
* Use Xenial
* Cache binaryen
* dalek-ed25519 (WIP)
* Small test cleanups
* Revamp binaryen cache
* Update ed25519 tests
* Remove externals for sr & ed
* Test with --release