When running the example from the README, I get not in gzip format

Relevant code:

```ruby
config = {
  base_url: "https://rally1.rallydev.com/slm",
  username: "xxxxxxxxxxx@xxxxx.com",
  password: "xxxxxxxxxxxxxxx"
}

@rally = RallyAPI::RallyRestJson.new(config)
```

I'd expect that to success but I get an `not in gzip format` exception

EDIT: A possible fix is just to disable the `transparent_gzip_compresion` flag passed to the HttpClient config