acu71002 - change the idiom we use to re-raise exceptions, ensuring that we preserve the original backtrace and don't overwrite it with useless cruft.
acu71002 add some more default-fatal exceptions; refactor the introspection and the class constants to better distinguish between types of default-fatal exception.
acu71002 consider fatal-ness of exceptions during health check as well as during request.
acu71002 bump gemspec
Merge pull request #78 from rightscale/teal_13_1_71002_rspec_exception_masking

acu71002 - improve RequestBalancer fatal-error handling and also test-framework interactions