**Is your feature request related to a problem? Please describe.**
It's frustrating there's no option to turn off decompress. There are situations where you want to do this. Ex: having a service that collects data, but doesn't analyze it. which then passes to another service immediately/eventually.

While data is waiting or in traffic to next stop, it should stay compressed. The difference in byte size is huge (for me, 60MB vs 1-2MB). 

**Describe the solution you'd like**
Add an option to the request to not automatically decompress for me. I'm a big boy, I can handle it myself later.

**Describe alternatives you've considered**
There are none except user another lib or write own http req (which is ridiculous just to turn off a auto feature).


I can submit a PR if no one else wants to do it (it's not hard to add). But let me know how you'd like the option to be passed in? An extra options key? `axios({ url: ..., method: ..., decompress: false })` , or adding option to an existing option?


test/unit/adapters/http.js
if (req.method.toLowerCase() !== "head") {
        res.statusCode = 400;
        res.end();
        return;
      }
      var parsed = url.parse(req.url);
      if (parsed.pathname === '/one') {
        res.setHeader('Location', '/two');
        res.statusCode = 302;
        res.end();
      } else {
        res.end();
      }
    }).listen(4444, function () {
      axios.head('http://localhost:4444/one').then(function (res) {
        assert.equal(res.status, 200);
        done();
      }).catch(function (err) {
        done(err);
      });
    });
  });
  it('should support transparent gunzip', function (done) {
    var data = {
      firstName: 'Fred',
      lastName: 'Flintstone',
      emailAddr: 'fred@example.com'
    };
    zlib.gzip(JSON.stringify(data), function (err, zipped) {
      server = http.createServer(function (req, res) {