FirstRelease: add .npmignore file and some fields in package.json

Author: flore77

.npmignore

@@ -0,0 +1,2 @@
+.travis.yml
+.npmignore

package.json

@@ -1,8 +1,16 @@
 {
   "name": "js-reporters",
   "version": "1.0.0",
+  "description": "common reporter interface for javascript testing frameworks",
+  "main": "dist/js-reporters.js",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/js-reporters/js-reporters.git"
+  },
   "scripts": {
     "build": "rollup -c",
+    "prepublish": "npm run build",
     "pretest": "npm run build",
     "test": "standard && node test/test.js && npm run test-integration && npm run test-unit",
     "test-unit": "mocha --recursive test/unit/",