Add dependencies for spring security
View for sign in and sign out has been added. Authentication still
missing but AuthProvider is prepared for use.
Catch the post request into controller
Transaction for EM is not closed so saving into database does not
work.
Chapter about 'password' trigger and spring security dep. has been removed
Chapter about Spring and MVC and so on.. Sign in logic added..
IC and AoP
Sign into webapp by session
Merge branch 'feature/signin' into develop