Move to MIT license

[thomasp85]

I've been gradually moving my repos to the more permissive MIT license and wish to do that for ggforce as well. @sidiropoulos, @lepennec, @andrewheiss, and @daniel-wells you have all made significant contributions through new features or bug fixes and thus have a say in license changes (as it concerns code you've written).

If you have any objections to moving to MIT licensing please respond to this issue, otherwise the change will go in effect in one week.

If you have any questions concerning this, please let me know as well. Thanks for your contributions.

[andrewheiss]

I'm fine with MIT. All my personal stuff is MIT already and I'm a big fan.

[lepennec]

Obviously, no issue for me!

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[sidiropoulos]

Same here!