Add possibility to use EXTENDEDMIND_API_URL for backend address.
Add possibility to use EXTENDEDMIND_API_URL for backend address.

extendedmind/extendedmind,extendedmind/extendedmind,extendedmind/extendedmind,extendedmind/extendedmind,extendedmind/extendedmind,extendedmind/extendedmind,extendedmind/extendedmind