Autmoatic pypi deployment

[thouska]

Triggers the upload on pypi if a new version of spotpy is taged on github (as suggested in #225)

[thouska]

Further defines package dependencies as requested in #249

[coveralls]

Pull Request Test Coverage Report for Build 862

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.04%) to 89.757%

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Files with Coverage Reduction	New Missed Lines	%
spotpy/algorithms/fscabc.py	1	80.43%
spotpy/algorithms/rope.py	1	93.58%
<!--	Total:	2		-->

Totals
Change from base Build 857:	-0.04%
Covered Lines:	4136
Relevant Lines:	4608

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💛 - Coveralls