Allow multiple gmaps keys (one per domain)

Hi. Currently only one google maps key can be defined in ini file. It could be nice to have the posibility to define several keys, one for each (sub)domain involved in your project.

this could be nice for having gmaps working in development and production domains. Also it could be good for sites having multihost acces type and having subdomains like spanish.mysite.com and english.mysite.com, for example.


Probably we could define these keys in each siteaccess, but i suggest to define an array of keys like