Convert typed arrays into regular buffers

[simov]

Fixes #1904

This bug was introduced in #1733 regarding this issue #1732

Bringing back the code that was removed in #1733. Converting to Buffer happens only when the body is a typed array. That way this won't affect the performance fix for #1732

One additional dependency was needed is-typedarray

[NNM11]

I just installed request v1.4.28. It is not fixed. I still got this error :

"http.js:852
throw new TypeError('first argument must be a string or Buffer');
^
TypeError: first argument must be a string or Buffer
at ClientRequest.OutgoingMessage.write (http.js:852:11)

at Request.write (/usr/hdc-solution/node_modules/request/request.js:1347:25)"

with
var indata = { 'key':'value', 'num':number'};
var opts = {
url : endpoint,
proxy : proxyUrl,
method : "POST",
headers : {
'Content-Type' : 'application/json', // HDC data type specific
'Content-Length' : Buffer.byteLength(JSON.stringify(indata))
},
json : indata
};

[simov]

I just installed request v1.4.28. It is not fixed.

The latest request version is 2.67.0