Remove Accept-Encoding header from requests
Remove Accept-Encoding header from requests

The header had the wrong format (`gzip/deflate` instead of `gzip, deflate`) and was ignored by the server.  Setting the header is unnecessary, because Go's HTTP client transparently asks for and handles decompression.  If you manually set `Accept-Encoding` you must manually decompress the payload, which the library does not do.
joeshaw/iron_go,iron-io/iron_go