Geolocalisation

A complete standalone branch for the geolocalisation purpose.
Caution, it is an independant app ! But good start for integration purpose.

Main functionnalities : 
- The map is loaded and centered from the current position of the android device (if possible, if not, centered on Ecole Centrale de Nantes)
- The current position can be replaced b the GPS localization of a picture (pass in parameter)
- User can deploey markers on map (up to 2 or 4, defined as constant)
- Each marker displays the postal address in a pop-up
- Markers are linked with line (in fact, a polygon made of all the markers's position)
- User can switch from differents types of maps (from Google Maps) : normal, satellite or hybrid.
- A button can force the app to recenter the view with device position
- If GPS is not activated, a dialog is open to propose user to switch it on (shortcut to parameters)
- If Google Service is not installed or up to date, a dialog informs user that an instal/update is required.

Known-errors : 
- The switch between landscape and portrait causes a restart of the app (so no ore markers, etc)