tests: Set casperjs viewport size to a reasonable browser size.

Otherwise we're by default testing the phone size layout, which
probably isn't what we want the default test setup to be.

(imported from commit a76b2d51c18824b0a5f6342cce848aca87dda15a)

zephyr/tests/frontend/common.js

@@ -1,3 +1,6 @@
+// Set default viewport size to something reasonable
+casper.page.viewportSize = {width: 1280, height: 768 };
+
 var common = (function () {
 
 var exports = {};