Use DictMixin to make D object behave like a dict. #136
Add real test of items()
Add Web Sequence Diagrams filter
Add unit test for websequence filter
Tidy up websequence settings docstrings
PEP8 Websequence
Don't raise base Exception class in API filter
Changes per code review
Support neato use through graphviz filter
Merge branch 'graphviz_args' into develop
Merge branch 'websequencediagrams' into develop
Add more options for custom name generation