Fix 256 color support #797
WIP: add delete execution functionality, and API
Initial gui support for exec delete
Remove extra flash.message
WIP: add bulk delete
Handle not found execution for bulk delete
Add api endpoint for bulk execution delete
Add docs for api v12, execution single/bulk delete
Update api to v12
Require api v12 for execution delete
API version requirement response can send json
Add bulk execution delete for history views
pagination method css classes parameterized
add execution bulk edit controls, modal on activity page
Add delete_execution project authorization requirement
Auth check in execution page for delete, cleanup button layout
Use btn-link style for job delete
Add support for deleting executions for a job

* add api for bulk deletion of job executions
Gui checkbox to delete executions for a job when deleting the job
Log all execution events (start,finish,delete) to log4j

logger name: org.rundeck.execution.status