Vector Class Discussion

Thanks for an excellent library. I tried using it on a platform with XOP instructions, but it didn't compile. It seems like a cast in vectori128.h is misspelled. Also, it seems like clang has issues with XOP and implicit conversions to int32_t. See my fixes in my github repository below and tell me what you think.

https://github.com/ember91/vectorclass/commits/master

/Emil