Cleaned up karma configuration files

tests/karma-travis.conf.js

@@ -1,26 +0,0 @@
-module.exports = function(config) {
-  config.set({
-    frameworks: ["jasmine"],
-    browsers: ["Firefox"],
-    autowatch: false,
-    singleRun: true,
-
-    preprocessors: {
-      "../src/*.js": "coverage"
-    },
-
-    reporters: ["spec", "failed", "coverage"],
-    coverageReporter: {
-      reporters: [
-        {
-          type: "lcovonly",
-          dir: "coverage",
-          subdir: "."
-        },
-        {
-          type: "text-summary"
-        }
-      ]
-    },
-  });
-};

tests/karma.conf.js

@@ -1,7 +1,6 @@
 module.exports = function(config) {
   config.set({
     frameworks: ["jasmine"],
-    browsers: ["Chrome"],
     autowatch: false,
     singleRun: true,