Adding NotificationAds code (still lack the library)
Updating README
Merge branch 'develop' of https://github.com/ubee/ubee-ads-example into develop

# By Gabriel Falcone
# Via Gabriel Falcone
* 'develop' of https://github.com/ubee/ubee-ads-example:
  Corrigindo readme
Update ubee-api jar
Updating ExampleActivity to supports NotificationAd
Adding NotificationActivity to show a NotificationAd result.