Test for GitHub issue #1: removed absolute path for iwlist

lib/iwlist.js

@@ -4,7 +4,9 @@
  */
 
 const _       = require('lodash');
-const tool    = '/usr/bin/iwlist';
+// usually located in /usr/bin/ but as it could be at another location, allow all found in PATH (but we're in trouble
+// when the default location, /usr/bin/ is not in the PATH!). GitHub issue #1
+const tool    = 'iwlist';
 const cmdLine = tool + ' scan';
 
 const macRegex  = /([0-9a-zA-Z]{1}[0-9a-zA-Z]{1}[:]{1}){5}[0-9a-zA-Z]{1}[0-9a-zA-Z]{1}/;