Bump lager version to 2.1.0#1

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sebmaynard wants to merge 3 commits intoEchoTeam:masterfrom

sebmaynard:master

Commits on Feb 5, 2015

Bump lager version to 2.1.0
sebmaynard
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Commits on Jan 27, 2017

lager 3.2.4
sebmaynard
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Commits on Feb 9, 2017

more resilient get_supervisor_state that doesn't rely on the order of return values from sys:get_status
sebmaynard
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