test_NumberFormatter errors with ICU 58.2 when run by setup.py

[mkszuba]

When I run "python setup.py test", all three tests in test_NumberFormatter.py produce errors due to the absence of NumberFormatter. It seems the ICU-version guard present in the file, which does work when the script is executed directly, needs to be extended to handle this mode of execution.

[ovalhub]

fixed in HEAD