regression: NotImplementedError: operator '*' not implemented for bool dtypes
seemed to work just fine (with  0.13.1) and I do not see why it should not if you are decorating numpy arrays here:

```
  File "/home/neurodebian/proj/numpy-vbench/vbench/vbench/analysis.py", line 83, in __call__
    Tts, Tps = ss.ttest_1samp(test_samples.timing, results.timing)
  File "/usr/lib/python2.7/dist-packages/scipy/stats/stats.py", line 2887, in ttest_1samp
    t = np.where((d==0)*(v==0), 1.0, t) #define t=0/0 = 1, identical mean, var
  File "/home/neurodebian/deb/gits/pkg-exppsy/pandas/pandas/core/ops.py", line 505, in wrapper
    return left._constructor(wrap_results(na_op(lvalues, rvalues)),
  File "/home/neurodebian/deb/gits/pkg-exppsy/pandas/pandas/core/ops.py", line 445, in na_op
    raise_on_error=True, **eval_kwargs)
  File "/home/neurodebian/deb/gits/pkg-exppsy/pandas/pandas/computation/expressions.py", line 196, in evaluate
    _bool_arith_check(op_str, a, b)
  File "/home/neurodebian/deb/gits/pkg-exppsy/pandas/pandas/computation/expressions.py", line 177, in _bool_arith_check
    "dtypes" % op_str)
NotImplementedError: operator '*' not implemented for bool dtypes
```
