#74 added Heroploy.config_vars to read environment matcher definitions
#74 VarReader looks up variables in the shared environment
#74 load remote configs for Heroploy.config_vars
#74 fixed breaking tests
#74 fixed VarReader in cases where variable isn't defined
Merge pull request #76 from jbrunton/dev-74-local-config-vars

Close #74: Load config vars when running locally from 'local' environment