MGOGRelationship with its primary key and unidirectional OneToOne
mapping to Goal (MG and OG)
GoalAssociation management (save, change, remove)
Now it is possibile to associate goals
Association between goal is starting to work
Association between goal working with mapping specified inside
Embeddable class (only supported in Hibernate)
Goal Type selected in GoalForm if the Goal already exists
Functions for recovering associated goal
Show associated goal in goal form, if goal already exists
AssociatedGoal handling
Fixed error in GoalFormController
Goal Form
Goal association working
Goal association
Merge branch 'mgogrelationship' into mgogrelationship_ongoal

Conflicts:
	src/main/java/it/uniroma2/gqm/webapp/controller/GoalFormController.java
Code cleaned by comments and unused old function
Merge branch 'entityChange' of https://github.com/PuRoTeam/PuRoGQM into entityChange

Conflicts:
	src/main/java/it/uniroma2/gqm/model/Goal.java
	src/main/webapp/WEB-INF/pages/goalform.jsp