[FIX] fix NoseTester's raise_warning default

Our test-runner's raise_warning mode traditionally has varied depending
on whether we have a development or release version of numpy: for
development versions we raise on warnings, and for release versions we
don't. This is all very sensible... *if* you're running numpy's test
suite. But our test-runner is also used by other packages like scipy,
and it doesn't make sense for scipy's raise_warning mode to vary
depending on whether *numpy* is a development or release version. (It
should vary depending on whether the scipy-under-test is a development
or release version.) So this commit moves the numpy-version-dependent
raise_warning logic out of the generic NoseTester class and into
numpy-specific code.

(See scipy/scipy#5609 for more discussion.)

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