Actdiag

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* Drop python3.6 support
* Use funcparserlib-1.0.0a0 or newer to support new python versions
* Allow to write multiline string via triple quotes (""" ... """)

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* Drop python2 and python3.4 support

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* Follow blockdiag-1.5.0 interface

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* Change interface of docutils node (for sphinxcontrib module)

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* Add options to blockdiag directive (docutils extension)
- :width:
- :height:
- :scale:
- :align:
- :name:
- :class:
- :figwidth:
- :figclass:

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* Fix bugs