#14 custom scope support

[Darren Davison]

spring 2.x scopes (session/request etc) are supported, but if beans are defined with custom scopes, the output will try to display icons in the graphviz images and HTML pages that don't exist.

Solution is to have custom scopes linked to images on the user's file system (has to be local for graphviz) and define these links in beandoc.properties ...

myscope.icon=/path/to/myscope.png