Added a placeholder background for the main menu

We are going to have to change this once things get styled
Fixed bug where the image sub view could not be presented and the app would crash
Updated Nimbus SDK to 1.2.1
Updated the code to share images via social media due to a change with the Nimbus SDK
Added Teams view and incorprated it into the main menu
Fixes #7, fixed main menu to not reload the existing selected menu

Added a state value to keep track of which menu item is select and then spawn the new item or just close the main menu