Proposal: converting Integer with DataView

[dukelec]

First of all, thank you for your work.

Currently only float is being converted using DataView, why not use DataView to convert Integer uniformly?
If we all use DataView, the code will be shorter and easier to read, also less prone to errors.

Recently I needed to use the little-endian version of msgpack.
I modified a python library and all I had to do to modify the endianness was to change the symbol ">" to "<".
To modify the javascript library, I only had to change the DataView functions parameter from false to true, but since you don't use DataView, it's a bit confusing: https://github.com/dukelec/msgpackel

Modification for the python library:

Modification for the javascript library: