Add support for negative duration values in ISO8601 period parsing #59
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Fixes #41.
We are using a mixed Java/Python stack, and would benefit from the addition of support for negative duration values in the ISO8601 period parsing. For example,
PT6H-30M
would correspond to a duration of05:30:00
.As mentioned in #41, there is a precedent for supporting this format, looking for instance at MomentJS (moment/moment#2955).