Non-default `color_cycle` not working in Pie plot

Changing the default `color_cycle` works in other charts but not in pie.

```
import matplotlib as mpl
import matplotlib.pylab as plt

mpl.rcParams['axes.color_cycle'] = ['c', 'm', 'y', 'k']

fig, ax = plt.subplots()

ax.pie([15, 30, 45, 10])
```

New colors can be used only changing the `colors` parameter of pie.

> Versions: MPL 1.4.3 - Python 3.4.1 - Windows
