Enabled setting max/min zoom level in declarative map

Created setters for max & min zoom level qproperty in declarative geo map.
The new max/min values are set in the gesture area so the camera data
values set by the plugin are still intact.

Change-Id: I502159c1842238f41c2d598d2fb82c761af9535b
New copyright logo for nokia maps plugin

Since Nokia maps is now Here maps we need to update the copyrigt
logo in the maps view to the Here logo.

Change-Id: Ice6b08afbe7eedefd93a6fb1733df1aa07f30577