Added custom mail and subject for contact forms and new encode/decode with salt methods
Added cool featres to stack node-tree when using tags:

* Filter your tree by tag
* When a quick add button is present, you can create a node with the current filtering tag
* When you click a tag in tagtree you go directly to tagged nodes.
* Links in tagged node page go to editSource page
Merge branch 'feature/form' into develop