Decorator for Connection Removal

This decorator is intended to be registered at connections in the Model Editor. At the point where a connection is
no longer rendered as a line - the decorator will trigger a removal of the connection node.

The removal is triggered whenever a src and dst is defined for the node, but one of the targets is either null or
undefined. Before the removal the decorator ensure that the model isn't read-only, a meta-node nor an inherited child.

!ConnRemoverDecorator

Import decorator to your own webgme repository

Make sure webgme-cli is installed globally in npm, then execute from root of your repository:
``
webgme import decorator ConnRemoverDecorator webgme-connection-remover
`

Developers

#### Publish new release at npm
`
npm prune
npm install
npm version 1.1.0 -m "Release %s"
git push origin master
git checkout v1.1.0
git push origin v1.1.0
npm publish ./
``