Feature/improved selection management

[aarranz]

Update current algorithm for updating the selected PoIs:

• If current zoom level is lower than the configured one, then zoom in the view and center the view on the PoI.
• Zoom out current view if the PoI representation didn't fit current view
• Move current view if the zoom level is adequate, but it isn't visible on the current viewport.

Probably this is not the perfect behaviour, but I think this is better than the current one.

[coveralls]

Coverage increased (+0.1%) to 98.121% when pulling a9629d2 on aarranz:feature/improved-selection-management into 4853723 on Wirecloud:develop.