Update nodes page/adhoc page

* add Commands tab for adhoc executions
* some cleanup of nodes filtering
* modal save/delete for node filters
* commands page loads adhoc activity if no nodes are selected.
Core support for node filter textual syntax

* single string defines multiple filters
* key: value
* !key value for exclusion
* quoting rules same as options
Rundeck server node shows Rundeck logo

* remove description from default node display
Panel footer, floated buttons should have margin

* .placeholder should apply only to input
Change List param to Collection for OptsUtil.join
WIP: filter string support
Update controllers/services to use node filter string
Update views/js for node filter string support
Node filter save form updated:

* single text field for name
* automatically overwrites
Add ajax node filters to commands page