Added appRate to demo.

Signed-off-by: Simon Reimler <Simon.Reimler@bertelsmann.de>
Minor changes.
Merge pull request #507 from saimon24/fix-appRate-plugin

AppRate functions in demo-project
fix(plugin:appRate): rename to lowercase
fix(plugin:statusbar): isVisible is not method
fix(plugin:FB): refractor out init --> now set in config using $cordovaFacebookProvider
feat(plugin:appVersion): new plugin AppVersion

https://github.com/whiteoctober/cordova-plugin-app-version
fix(plugin:appVersion): add dependency to module
chore(rebuild): dist
Update README.md
fix(tests): statusbar
Merge branch 'master' of https://github.com/driftyco/ng-cordova
feat(plugin:appRate): refractor to use Provider more