Ability to define custom projection. #166
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This PR adds the ability to explicitly set the projection used to produce the plot. The prior behaviour simply used the projection of the supplied data. It addresses #164
If the user specifies a projection that is different to that of the supplied data, the data is transformed onto the new projection.
Also if the data does not have a co-ordinate system (e.g. most of the CMIP5 data under /project/champ) PlateCarree is assumed.
Lastly I removed the try clauses around getting the x and y coords, since if a coord not found error is ignored here it will almost certainly cause problems further on but be harder to debug.