+ first drafts of singleton data manager
Merge branch 'develop' of github.com:SaltySoft/ContactsAndroid into develop

Conflicts:
	SaltyContacts/SaltyContacts/src/main/java/com/mti/saltycontacts/activities/ContactEdition.java
	SaltyContacts/SaltyContacts/src/main/java/com/mti/saltycontacts/activities/MainActivity.java
+ added phone numbers persistance