Commit be908ac0247a2df3d70b385dc64ba719be152140

DRC 2016-10-05T14:42:35

Travis CI: Fixes to support AVX2 code -- Use trusty for SIMD builds. Ubuntu 12.04 is still using NASM 2.09.x, which isn't new enough to support AVX2. -- Add a special test for the SSE2 code path, since it is no longer the default.