#93: Added gzipped response support

[ewandennis]

• Request's gzip option now defaults to true with caller control
• Bumped nock version to enable gzip support

[aydrian]

Did you do a --save when you npm installed the gzip library?
You need to make sure that the updated nock and zlib libraries are in the package.json

[ewandennis]

This pr relies on node's own zlib module - no external gzip lib required and package.json has had the nock version bumped. The failing Travis report dies while writing its coverage report in node 0.10 which isn't too clear - will attempt to repro.

[ewandennis]

I had a test that used zlib.gzipSync() which wasn't introduced until after node 0.10. I also didn't run the Mocha test suite against node 0.10. I just used the default grunt task which produces coverage data from the tests while sorta masking the test results themselves.

[aydrian]

LGTM