Sign up

[ximenaperez]

• Create screen to sign up.
• Create screen profile displaying the user name after signing up.
• Add base methods to baseActivity to display loader, show errors, and start a clear task activity.
• Add base methods to base viewModel to register and unregister for events.
• Add rails base url to dev flavour.
• Fix minor compiling errors in a name change.

[CamilaMoscatelli]

Great work! 👏