ENH: add nonlinear version of ADMM, closes #1201#1202

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kohr-h wants to merge 6 commits intoodlgroup:masterfrom kohr-h:issue-1201__nonlinear_admm

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Commits on Nov 11, 2017

ENH: add nonlinear version of ADMM, closes odlgroup#1201
Holger Kohr
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ENH: add ADMM spectral CT example
Holger Kohr
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MAINT: add license header to admm.py and fix unicode issue
Holger Kohr
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TST: add small unit test for nonlinear ADMM solver
Holger Kohr
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ENH: simplify and optimize some proximal operators
Holger Kohr
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TST: add ADMM tests optimized vs. simple
Holger Kohr
committed