Cherry-picking a year's worth of forks#6

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thijzert wants to merge 5 commits intodeviservi:masterfrom

thijzert:master

Commits on Dec 4, 2015

latest original version
Boris Tolstukha
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Commits on Dec 15, 2015

readme
Boris Tolstukha
committed

Commits on Feb 15, 2016

Pass charencoding setting so that WSDL object respects that setting.

root
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thijzert
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utf-8 encoding instead of iso-8859-1

Dukecz
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thijzert
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Null values has xsi:nil in xml request instead of being empty

Dukecz
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thijzert
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