Is this library endian-agnostic?

[BrannonKing]

Some of the pointer casting in the library made me nervous. Why not use bytes.BigEndian.Put?

[itsmontoya]

@BrannonKing after tons of benchmarking, the pointer casting gave me the best performance and least allocation. I'm definitely all for removing scary code if there isn't a huge performance cost of using a stdlib func. I should have time to look into this within the next week. I'll create a branch with this change and do some performance testing against it. If there isn't much of a performance hit, I'll gladly switch over.