Added support for NChannelImage and ExtendToNChannel


Sorry for all the previous open/close pull requests. This is the only merge to look at.

Hmm it's used by RGB image to make the random jitted on hue (ie, random hue
rotation). :/


On Thu, Jul 10, 2014 at 2:42 PM, J.L Stevens <notifications@github.com>
wrote:

> In imagen/image.py:
>
> >      """
> >
> > -    filename = param.Filename(default='images/numpy_array_feret_photo.npy',precedence=0.9,doc="""
> > -        File path (can be relative to Param's base path) to the Numpy file.""")
> > +    random_generator = param.Callable(
> > +        default=numbergen.UniformRandom(lbound=0,ubound=1,seed=1048921))
> >
>
> I hope this isn't being used (i.e. this should be removed) otherwise there
> are bigger problems to worry about!
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/ioam/imagen/pull/29/files#r14765980>.
>