work in progress version of the sendfile filter
Implemented sendfile filter and unit tests
Implemented sendfile filter and unit tests
Ensure integs actually use the gem versions we preinstall
Fix compatibility with Rack 1.4.3 in 1.9 mode (TORQUE-993)

Rack added an each method to their BodyProxy which means every body
now responds to .each, even if our underlying body is a String in 1.9
mode where Strings don't have an each method.

Technically the Rack spec says our body should not be a String
instance, but moving away from that is a bigger change than I want to
make right now.
Upgrade to JRuby 1.7.2 (TORQUE-992)
Loosen up some integ .yml file matchers w/ JRuby 1.7.2 (TORQUE-992)

Looks like JRuby 1.7.2 now quotes some values in emitted YAML that it
didn't used to. This is perfectly fine, but our spec matchers weren't
expecting the quotes.
Merge pull request #113 from parbst/2x-dev

Enabling native sendfile for rack