Provide a makefile

[coveralls]

Pull Request Test Coverage Report for Build 796

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.2%) to 90.009%

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Files with Coverage Reduction	New Missed Lines	%
spotpy/algorithms/rope.py	1	93.58%
spotpy/algorithms/sceua.py	2	88.79%
spotpy/algorithms/dream.py	6	89.22%
<!--	Total:	9		-->

Totals
Change from base Build 795:	-0.2%
Covered Lines:	4135
Relevant Lines:	4594

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💛 - Coveralls