Initial project structure
Add splash screen for Dropbox sign in. Add default dimnes following Android Official design guidelines
Add sign in error label and color support to some Android versions
Add native components from Dropbox SDK for each supported Android platform
Add Dropbox Sync SDK
Implement sign in functionality. Add app and secret keys from Dropbox app console
Implement sign out functionality. Add null checks of DbxAccountManager to prevent from NPE
Fix bug when user signs out and SignActivity didn't finish after sign in
Refactor transition between SignActivity and MainActivity
Add important comment to Util class
First iteration of Sign in into Dropbox user account finished. Ready for Pull Request
Merge pull request #1 from vicfran/feature/sign-in

Sign in
Merge pull request #2 from vicfran/develop

First development iteration