Handle GZip-encoded Twitter API responses

[kennym]

This PR does not include any spec coverage/documentation. I am asking for guidance on how to write a spec for this. Can you give me any hints?

[kennym]

Fixes #547, #548 and #473

[kennym]

/cc @sferik

[coveralls]

Coverage decreased (-0.3%) when pulling 11736f4 on kennym:gzip-fix into 7b40188 on sferik:master.

[coveralls]

Coverage decreased (-0.28%) when pulling 11736f4 on kennym:gzip-fix into 7b40188 on sferik:master.

[paracycle]

@kennym I believe this issue is actually caused by a bad monkey-patch in another gem (most likely right_aws or right_http_connection). See arsduo/koala#346 for a similar issue and resolution.

As it currently stands, IMHO, it doesn't look like the onus is on this gem to rectify what is broken by another gem.

[kennym]

@paracycle ha, that makes sense. I will check if that's the case.

[kennym]

@paracycle something tells me the culprit lies within: https://github.com/rightscale/right_http_connection/blob/master/lib/base/net_fix.rb

This is why nobody should never ever use a gem with monkey patched base classes on a global scope.