- added support for association classes (drawing)

compiler/astAttributes.ts

compiler/pumcl.jison

index.html

index.ts

model/associationClass.ts

model/classDiagram.ts

model/notes.ts

model/packages.ts

model/relations.ts

modelBuilder/associationClassBuilder.ts

modelBuilder/notes/noteBuilder.ts

modelBuilder/relations/relationBuilder.ts

pumcl.js

readme.md

tests/theme/themeTest.ts

transformers/graphviz/transformToGraphviz.ts