refactor create-release-pr to a package

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

.gitignore

@@ -1,15 +1,8 @@
-dist/
 node_modules/
 .DS_Store
 yarn-error.log
-coverage/
 tmp/
-locales/**/**.js
 lens.log
-static/build
-static/types
-binaries/client/
-binaries/server/
 docs/extensions/api
 site/
-build/webpack/
+lerna-debug.log