chore: switch from Gruntfiles to npm scripts, see #5

Gruntfile.js

@@ -1,29 +0,0 @@
-module.exports = function(grunt) {
-  grunt.initConfig({
-    babel: {
-      scripts: {
-        files: [{
-          expand: true,
-          cwd: 'src',
-          src: '**/*.js',
-          dest: 'build/'
-        }]
-      }
-    },
-		clean: {
-			files: ['build/**/*.js']
-		},
-    watch: {
-      scripts: {
-        files: ['src/**/*.js', 'server/**/*.js'],
-        tasks: ['babel']
-      }
-    }
-  });
-
-  grunt.loadNpmTasks('grunt-babel');
-	grunt.loadNpmTasks('grunt-contrib-clean');
-  grunt.loadNpmTasks('grunt-contrib-watch');
-
-  grunt.registerTask('default', ['clean', 'babel']);
-};