Setup -> ProjectManager

@stowellm 

ProjectManager is now like CredentialManager, it saves the project in saved prefs and has setter and getter functions.  #22, #21 

Motion app says "Motion App Recording" instead of "Data Walk Recording" in notification while recording. #23 
Since these are constant, pull them out into some private variables at the top of the file like

private static String DEFAULT_PROJ_DEV = "248"