Allow user to use env variables with gatewaystart.sh#57

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sblackstone wants to merge 2 commits intoIbcAlpha:masterfrom

sblackstone:allow_env_vars

Commits on Jun 24, 2019

Allow user to use env variables with gatewaystart.sh
sblackstone
committed

Commits on Jun 26, 2019

Make changes more user friendly while retaining ability to use env variables
sblackstone
committed