Update dependencies and remove outdated ones (#722)

* Update dependencies and remove outdated ones
* Add package lock file
* Add minified file
* Karma now uses headless browser to run QUnit
* Add to readme that node and npm install is required
* Update license info
* Add lint-new but don't use it in CI yet

.circleci/config.yml

@@ -0,0 +1,29 @@
+version: 2
+jobs:
+  build:
+    working_directory: ~/impress.js
+    docker:
+      - image: circleci/node:current-browsers
+    steps:
+      - checkout
+      - run:
+          name: update-npm
+          command: 'sudo npm install -g npm@latest'
+      - restore_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+      - run:
+          name: install-npm
+          command: npm install
+      - save_cache:
+          key: dependency-cache-{{ checksum "package.json" }}
+          paths:
+            - ./node_modules
+      - run:
+          name: build
+          command: npm run build
+      - run:
+          name: lint
+          command: npm run lint
+      - run:
+          name: test
+          command: npm test