Added a 'set_up' and 'tear_down' which are like tasks, but execute before and after roles.
Rename set_up and tear_down to pre_tasks and post_tasks
Add documentation about pre_tasks and post_tasks with roles.
Allow handlers to run in between pre_tasks, roles, tasks, and post_tasks.
Document the new handler flushing system.
Update changelog
Update the release date & code names in the releases file.
Rewrote the precedence docs.
Fix doc formatting error
sysctl check fails if a custom sysctl_file is given.
Merge pull request #2730 from tomkins/devel

sysctl check fails if a custom sysctl_file is given.