Adds release scripts

Author: andrewn

package.json

@@ -7,6 +7,8 @@
     "raspi-cap-debug": "./bin/cap1188"
   },
   "scripts": {
+    "release:tag": "git tag $npm_package_version",
+    "release:npm": "npm publish",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "homepage": "https://github.com/andrewn/raspi-cap",