fixed jshint

@@ -32,13 +32,13 @@
 /*jshint maxstatements:30, maxcomplexity:10*/
 
 // node check
-if (process && process.title === "node") {
+if ('process' in this && process.title === "node") {
     console.error('CasperJS cannot be executed within a nodejs environment');
     process.exit(1);
 }
 
 // phantom check
-if (!phantom) {
+if (!('phantom' in this)) {
     console.error('CasperJS needs to be executed in a PhantomJS environment http://phantomjs.org/');
 }