Renames DropboxAPIManager to DropboxAuthManager
Renames DropboxAPIManagerStorer to DropboxAuthManagerStorer
Moves the interfaces package to br.nom.marcos.wolfgang.memoriesbox
Adds the MemoryViewerFragment

It's a first step towards a GUI and is meant only to be used in Dropbox data store/retrieve. It's far from a final form
Decreases the general padding
Changes the MainActivity layout to a vertical LinearLayout
Makes MainActivity use a single transaction when handling multiple fragments
Adds a save button to MemoryViewerFragment
Adds getDropboxLinkedAccount() to DropboxAuthManager
Adds support to save a memory to Dropbox

This is an initial approach and certainly is going to be changed
Creates MemoryModel class
Makes MemoryModel works as a wrapper to a DbxRecord
Adds javadoc to MemoryModel
Adds MemoriesAdapter and layout memory_list_item

This is a first step towards a list of stored memories.
Removes the linked account verification from LinkDropboxFragment

It now assumes that when the LinkDropboxFragment is displayed there's no already linked account.
The MainActivity is going to manage this.
Adds the linked Dropbox account verification to MainActivity

This way the MainActivity decides when the LinkDropboxFragment is showed or not.
Removes the DropboxAuthManager param from the onDropboxAccountLinked method on OnDropboxAccountLinkedListener interface.

Since the MainActivity is dealing directly with DropboxAuthManager it's not necessary to return a new object
Makes LinkDropboxFragment retrieve a DropboxAuthManager onAttach
Makes DropboxAuthManager able to start the authentication process from a different context

Instead of tying the DropboxAuthManager to a context forever, now it's able to use a different context
for authentication process, the current context (Activity or Fragment) is not altered
Changes LinkDropboxFragment to use itself as a context to Dropbox authentication process