Fix warnings when running specs
Improve information logged in log_request_end()

With this change, no longer will we log:
I, [2014-11-11T17:01:10.138555 #33103]  INFO -- : Completed in 1179ms | 200 | - bytes

Instead, we will log:
I, [2014-11-11T17:21:18.903014 #34801]  INFO -- : Completed in 1209ms | 200 OK | 3156 bytes
Make Ruby 1.8 and 1.9 happy
Code review feedback
Merge pull request #149 from rightscale/minor_improvements_for_request_logging

Minor improvements for request logging