- organized some imports
- changed user routes (log in/out and account creation)
- send JSON object for POST
- added log out service
- session management
Merge branch 'develop' of
https://github.com/paulinemontmayeur/RandOnClient into develop

Conflicts:
	res/values-fr/strings.xml
	res/values/strings.xml
	src/com/insa/randon/controller/MapActivity.java
	src/com/insa/randon/utilities/RequestExecutor.java