Removing From<Vec<u8>> and From<ByteBuf> was mistake

[misos1]

f8c4812
f810459
#3

They could coexists with ByteBuf::from and ByteBuf::into_vec if you think these functions are clearer in documentation. I never had problems with looking for From trait implementations.

Now is not possible to use it with generic functions which uses things like T: From<Vec<u8>>. There is reason why there are traits like From trait in rust.

And solution to problems like this #14 require even more extra glue code as before.

[nathanielc]

Would a PR to re-add From<Vec<u8>> and From<ByteBuf> be accepted? I have run into the exact case mentioned above where I need ByteBuf to implement the From<Vec<u8>> because it is used as a type parameter to another trait with that constraint.