Fix for installs with spaces in the absolute path

-If the explorer is installed to a directory that has a space character somewhere in the absolute path, the locking mechanism will not work correctly on non-windows computers and will cause undesired behavior without this fix

lib/explorer.js

@@ -1405,7 +1405,7 @@ module.exports = {
             // run a cmd that will determine if the lock should still be active
 
             try {
-              var cmdResult = execSync('ps -p `cat ' + pidFile + '` > /dev/null');
+              var cmdResult = execSync('ps -p `cat "' + pidFile + '"` > /dev/null');
             } catch (err) {
               // if an error occurs, the process is NOT running and therefore the lock should be deactivated
               deactivateLock = true;