Ensure the packaged tgz has the appropriate files

.npmignore

@@ -21,7 +21,7 @@
 /.travis.yml
 /.watchmanconfig
 /bower.json
-/config/ember-try.js
+/config/
 /CONTRIBUTING.md
 /ember-cli-build.js
 /testem.js
@@ -35,10 +35,22 @@
 /bower.json.ember-try
 /package.json.ember-try
 
+# other
+
+/tsconfig.json
+/API.md
+/CHANGELOG.md
+/RELEASE.md
+/*.tgz
+/.github/
+/documentation.yml
+/server/
+
 # typescript
 #
 # avoid publishing .d.ts or .ts files
 # until they have become enforced "public" APIs
 *.ts
+!/addon-test-support/**/*.js
 # to enable d.ts consumption remove the next line
 # !*.d.ts