added AMD support

plus some bug fixes

0.3.0: Merge pull request #15 from psteinb/multi_feature_query

• added multi-feature queries #15
• patched (not fixed as it's unfixable) compile-time detection of SSE et al under MSVC #14
• updated landing page

0.2.0: Merge pull request #12 from psteinb/cmake-detect-feature

• added cmake module to detect host features at build time
• fixed missing include for compile-time features
• fixed typo in preprocessor symbols that made compile-time calls return the wrong result

single-header ready

0.1.0

removing comments