Tests: Add karma config and dependencies

gulpfile.js

@@ -85,6 +85,10 @@ gulp.task('browser-test', shell.task([
   'find test/ -type f -name "*.js" | xargs browserify -o ./browser/tests.js'
 ]));
 
+gulp.task('karma', shell.task([
+  './node_modules/karma/bin/karma start karma.conf.js'
+]));
+
 gulp.task('minify', function() {
   return gulp.src('dist/bitcore.js')
     .pipe(closureCompiler({

karma.conf.js

@@ -0,0 +1,9 @@
+// karma.conf.js
+module.exports = function(config) {
+  config.set({
+    frameworks: ['mocha'],
+    files: [
+      'browser/tests.js'
+    ]
+  });
+};

package.json

@@ -92,6 +92,8 @@
     "lodash": "^2.4.1",
     "mocha": "~2.0.1",
     "run-sequence": "^1.0.2"
+    "karma": "^0.12.28",
+    "karma-mocha": "^0.1.9",
   },
   "license": "MIT"
 }