Merge pull request #681 from shenrie/master

Bumped ion-defs
Release Version 2.0.15
Bump Version to 2.0.16-dev
Bump pyon for agent state addition.
Merge branch 'master' of github.com:ooici/coi-services
Bump pyon for lost connection entry/exit.
Agent lost connection handling.
bump MI for new driver code to handle lost connections.
Merge branch 'master' of https://github.com/ooici/coi-services
Merge pull request #682 from shenrie/master

Change to Service Gateway to be able to specify return mimetype
removed debug print statements
Merge branch 'master' of github.com:ooici/coi-services
Merge branch 'master' of https://github.com/ooici/coi-services
Added ServiceRequest objects to extended Marine Facility