Units examples broken #4802

Traceback (most recent call last):
  File "radian_demo.py", line 10, in <module>
    x = [val*radians for val in np.arange(0, 15, 0.01)]
  File "radian_demo.py", line 10, in <listcomp>
    x = [val*radians for val in np.arange(0, 15, 0.01)]
TypeError: __array_wrap__() missing 1 required positional argument: 'context'

Traceback (most recent call last):
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 126, in __new__
    return object.__new__(subcls, value, unit)
TypeError: object.__new__(TaggedValue_of_int) is not safe, use int.__new__()

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "artist_tests.py", line 34, in <module>
    line = lines.Line2D([0*cm, 1.5*cm], [0*cm, 2.5*cm], lw=2, color='black', axes=ax)
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 224, in __rmul__
    return self*lhs
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 221, in __mul__
    return TaggedValue(value, unit)
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 130, in __new__
    return object.__new__(cls, value, unit)
TypeError: object() takes no parameters

Traceback (most recent call last):
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 126, in __new__
    return object.__new__(subcls, value, unit)
TypeError: object.__new__(TaggedValue_of_MaskedArray) is not safe, use numpy.ndarray.__new__()

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "units_scatter.py", line 18, in <module>
    xsecs = secs*np.ma.MaskedArray((1, 2, 3, 4, 5, 6, 7, 8), (1, 0, 1, 0, 0, 0, 1, 0), np.float)
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 221, in __mul__
    return TaggedValue(value, unit)
  File "/Users/rmay/repos/matplotlib/examples/units/basic_units.py", line 130, in __new__
    return object.__new__(cls, value, unit)
TypeError: object() takes no parameters