1. Changed how old epub files should be removed by only removing files in the ASU folder. This should prevent log files from being deleted when the app restarts.
2. Re-initialized ServerCommunicationController in logContext so that new files will be empty. Previously, it was appending new data to the end of old data.
3. Created pressedLogout function in LibraryViewController. When the user presses the Logout button, they will be brought back to the login screen. (The previous login information will still show in the text fields.)