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Merge #626

626: Added warning for unsupported ufunc r=hgrecco a=kanhua

This PR attempts to close #620.

A ```UnitStrippedWarning``` is raised when an unsupported numpy ufunc is performed on the quantity.

This warning can be muted or amplified using ```warnings.simplefilter()```, for example,

```python
import warnings
import numpy as np
from pint import UnitRegistry, UnitStrippedWarning
warnings.simplefilter('ignore', category=UnitStrippedWarning)

ureg=UnitRegistry()
dist=24*ureg.meter

print(np.power(dis,2))

```

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