fix win64 float issue, enable AQ assembly
Add readme instructions for using msvc from developer command prompt.
Merge pull request #186 from ethanhugg/msvc_readme

Add readme instructions for using msvc from developer command prompt.
Merge pull request #172 from volvet/win64_float_fix_for_enc_b

fix win64 float issue, enable AQ assembly
Merge remote-tracking branch 'upstream/master' into travis.osx