Docs

[HDembinski]

• Adds doc strings extracted from C++ code
• Build html docs with sphinx
• New bindings for GenPdfInfo, GenHeavyIon, GenCrossSection

[coveralls]

Pull Request Test Coverage Report for Build 2949781702

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-1.9%) to 93.269%

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Files with Coverage Reduction	New Missed Lines	%
src/pyhepmc/init.py	2	81.82%
src/pyhepmc/view.py	8	90.36%
<!--	Total:	10		-->

Totals
Change from base Build 2940642399:	-1.9%
Covered Lines:	194
Relevant Lines:	208

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💛 - Coveralls