Update voxel-land to use asm.js simplex noise, and voxel-plugins/voxel-registry unit tests

deathcap/voxel-land@007104e2135e5602134a9401f624c1b9f92bdc39 Update simplex-noise.js
deathcap/voxel-plugins@b978aad4ceace902e6640f24ccf8dcc9b8b7b62f Update unit test exception to use tape throws()
deathcap/voxel-registry@90a76963a6d35e32fbc2b99d393b82e6030d374c Update unit tests to use tape throws()

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