So we don't fail on lager 2.1.x installs.
Use git:// rather than https:// so hosts don't need curl
Master branch can depend on master branch of syslog
Changed rebar dependencies to use https
Updated Lager dependency to version 1.2.*
Update syslog dep to 1.0.0, add explicit lager 1.2.1 dep
Update for lager 1.0