DataView endian parameters

[katis]

DataView doesn't support the littleEndian boolean parameter, and as such everything is written as big endian.

I could do this as a practice issue next week, but I'd like to know if there should be a new method (set_int32_endian or something) or just add the boolean parameter to the end for every method that needs it?

[alexcrichton]

Thanks for the report! It should definitely be ok to simply add new methods here which exposes the boolean parameters, and tacking on _endian to the end sounds good to me as well!

If you need any help with adding these just let us know!

[katis]

Fixed with #966