Expose logs about AAE build tree.
It helps users understand when and how much time AAE tree build was running in the past.
Merge pull request #1056 from basho/feature/expose-logs-about-aae-tree-status

Expose logs about AAE tree status.

Reviewed-by: seancribbs
Remove exometer instructions from Makefile

Chg to exometer_core in dep_apps()

check returns on stat update

unify wm_stat and status

missing option elements