Added react-hot-loader for web

Added react-hot-loader for web per to @iksent request in issue #27

Gradle update, babel fix, test scripts added

Gradle and Android build tools updated by Android Studio
babel config fixed #18
test scripts added #24
README file added to template

removed yarn.lock

removed yarn.lock from template to fix #17

changed access permissions

changed access permissions
related to #17

Reconstructed with create-react-app v2

Recreated the template from create-react-app cli v2 with all the new version

to solve issue #6