don't log warning if env file doesn't exist

Rather than adding CLI flags and introducing log levels, this seems like
the simplest way to address #95.

Author: rmg

lib/envs.js

@@ -127,7 +127,6 @@ function loadEnvsFile(path) {
   var env, data;
 
   if(!fs.existsSync(path)) {
-    cons.Warn("No ENV file found");
     env = {};
   } else {
     data = fs.readFileSync(path);