Changed karma to have a 60000ms capture timeout

The previous captureTimeout was so short that on computers with even
average hardware couldn't open firefox fast enough for Karma's liking,
mostly killing the process whilst firefox was still starting up.

test/karma.conf.js

@@ -57,8 +57,8 @@ module.exports = function(config) {
         browsers : ['Firefox'],
 
         // If browser does not capture in given timeout [ms], kill it
-        // CLI --capture-timeout 5000
-        captureTimeout : 5000,
+        // CLI --capture-timeout 60000
+        captureTimeout : 60000,
 
         // Auto run tests on start (when browsers are captured) and exit
         // CLI --single-run --no-single-run