Don't use import * to borrow imports from other modules

[jwiggins]

Wow... so this unit test was depending on an import nose in a module which it was doing an import * from.

This fixes some test failures seen in #279

[rkern]

LGTM pending relevant Travis checks.

[jwiggins]

Thanks. Note that I still expect failures because enthought/traitsui#369 has not yet been merged.

[codecov-io]

Codecov Report

Merging #280 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #280   +/-   ##
=======================================
  Coverage   35.39%   35.39%           
=======================================
  Files         206      206           
  Lines       18806    18806           
  Branches     2627     2627           
=======================================
  Hits         6656     6656           
  Misses      11724    11724           
  Partials      426      426

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[jwiggins]

OK. Only one failure (which was expected) from the CI run. I'm merging. Thanks for reviewing!