add base service and models
auto insert position-less items as last
admin: panels can preprocess url values for their own views
activities: check object is an Entity before creating log entry
admin: fix panel breadcrumb not inserted for panel's other endpoints
abilian/web/forms: add ModelForm based on .Form
add vocabulary panel
admin extension: fix additionals endpoint when panel has post method
style: add caret-up, caret-down, btn-inline
vocabularies: add up/down action
models: add __repr__