Add conf file for tree plugin development

Doesn't use the morph plugin for now - we don't want to spam the
morphology service...
Add dep(endency)Tree plugin files
Remove hr from history template
Show hr between main plugins in main2
Add depTree plugin to tree config file
First try at a e2e test for a tree
Add d3 and dagreD3
Create dagreD3 Digraph with depTree service
Disable failing e2e test
Add d3 as global to jshintrc
Draw tree using d3 in a directive
Use more specific selector to just get tree nodes

This is increases the test performance.
Update tree configuration
Let svg tree as high as it needs to be
Try to use token directive in tree

The tree is first created with div tags holding the token's string
representation. This ensures that the nodes are created with the
right size. Afterwards the content from the div is replaced
with the token directive. At the moment for no apparent reason the
last token is bound to the directive.
Add depTree to staging2
Remove heading in depTree template
Cleaning up depTree directive a little bit
Unset colors through morph plugin
Style the tree a little nicer