twitter/algebird — pull request #18 by mosesn (2012-08-26 07:39:05+00:00)
Title: error -> sys.error

## motivation
error is deprecated, sys.error is recommended to replace it. Algebird was giving me warnings, which were distracting, and easy to fix.

## changed behavior
No behavior has been changed

## question for algebird authors
My first commit was to replace error with UnsupportedOperationException (UOE), which describes what is happening here well. However, it broke a test, so I changed the UOE to sys.error. Do you really need it to error? That seems unnecessarily mean.