Add(globalMessages.spec.js).
Modify(app.spec.js): move test cases for messages to globalMessages.spec.js.
Modify(app.js): move logic for handling messages to globalMessages.js; remove unneeded module dependencies for errorHandler and eventMap; add module dependency for globalMessages.
Modify(globalMessages.js): add module dependency ui.bootstrap.
Modify(register.js): add module dependency globalMessages.
Modify(register.html): add div for displaying messages.
Add(header.js): for controlling header behaviour.
Modify(app.js): add module dependency for bankApp.header.