Hi, 

I would like the ability to setup a plot projection in MPL that can be defined 
by various parameters and does not need to be serialised as a string and 
registered with matplotlib.projections.register_projection.  For example, an 
extension of /examples/api/custom_projection_example.py might be to add the 
ability to define the central meridian to an arbitrary value rather than the 
current value of 0 - in this case I would expect to define the projection by 
creating an object which can then be turned into a matplotlib axes:

hammer_proj = Hammer(central_meridian=45)
ax = plt.subplot(111, projection=hammer_proj)

I have made a change to matplotlib which would enable this capability, which 
can be found at 
https://github.com/PhilipElson/matplotlib/commit/9c7b1b27d0245a752d010bd03ae66dc6c000d8e499
 . Any feedback and thoughts would be really appreciated with the ultimate goal 
of getting this functionality into MPL.

Many Thanks,

Philip
                                          
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