chore(release): Add release automation

Add publish script and process documentation.
Add npm script to publish to npm.
Update `build:dist` to use cross-env library.
Updates npmignore to clean up deployment package.

.npmignore

@@ -1,2 +1,13 @@
-example/
+example
+scripts
+src
+test
+.github
 .gitattributes
+.babelrc
+.editorconfig
+.eslintignore
+.eslintrc
+.travis.yml
+CONTRIBUTING.md
+webpack.config.babel.js

package.json

@@ -14,8 +14,9 @@
     "test.integration": "npm run build && karma start --single-run",
     "travis": "npm run test.unit && npm run test.integration",
     "generate.changelog": "node scripts/release/generate-changelog.js",
+    "publish.version": "npm run build:dist && sh scripts/release/npm-publish.sh",
     "build:dev": "webpack",
-    "build:dist": "NODE_ENV='production' webpack"
+    "build:dist": "cross-env NODE_ENV=production webpack"
   },
   "repository": {
     "type": "git",

scripts/release/README.md

@@ -0,0 +1,16 @@
+###Tag and Release process
+
+> Starting from a state where everything is in master that we want released.
+
+*The GitHub Portion*
+* Increment the version in the package.json and save.
+* Generate the changelog for the new release version `npm run generate.changelog`.
+* Run `git add .` to stage the changes.
+* Commit changelog & package version updates as `chore(release): karma-webpack <package version>`.
+* Run `git push` to send the changes to origin.
+* Run `git tag <package version>` to create our release tag.
+* Run `git push --tags` to send the tag to origin.
+
+*The NPM Portion*
+* `npm login` to the user with rights to publish to NPM
+* `npm run publish.version` which executes a `dist` build and publishes using the tag created above.

scripts/release/npm-publish.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Accepts a single argument as the tag for the release (such as "next").
+# Run this script from the root of the repo.
+
+# `npm whoami` errors and dies if you're not logged in,
+# so we redirect the stderr output to /dev/null since we don't care.
+NPM_USER=$(npm whoami 2> /dev/null)
+
+if [ "${NPM_USER}" != "mikaak" ]; then
+  echo "Publishing limited to 'mikaak'. Did you forget to 'npm login'."
+  exit
+fi
+
+# Defaults to latest github tag
+NPM_TAG="latest"
+if [ "$1" ] ; then
+  NPM_TAG=${1}
+fi
+
+# Sets the above
+set -ex
+
+# Publishing the defined tag to npm
+npm publish --access public --tag ${NPM_TAG}
+
+# Logs out of npm when publish is complete.
+npm logout