Query Editor - Stop-gap notification enhancements

Minor UX enhancements to support long-running queries for next release. These can be changed to provide even better UX in future releases (more of a stop-gap improvement).

* Disabled auto-query by default

* Added Result pane overlay w/ spinner during query execution making is very obvious that a query is still executing.

![query_editor___acs_aem_tools](https://f.cloud.github.com/assets/1451868/2491435/7876eac0-b1ec-11e3-8ced-db8b83fbaba9.png)

* 6 second auto-dismissed notification whenever auto-query is toggled on alerting the user that this may result in long-running queries and system unresponsiveness.

** Notification wording could use some love**

![query_editor___acs_aem_tools](https://f.cloud.github.com/assets/1451868/2491436/808c1c08-b1ec-11e3-9c00-a2f7c3e6e0db.png)

Only tested on OSX Chrome and FF.

@dchang @justinedelson - WDYT?