Make urlBase configurable

Add `setUrlBase` method to LoopBackResourceProvider to allow urlBase configuration.

Signed-off-by: Ariel Schiavoni <arielschiavoni@gmail.com>
Merge pull request #81 from arielschiavoni/feature/url-base

Make urlBase configurable
1.3.0
Merge branch 'release/1.3.0' into production
Merge tag 'v1.3.0'

1.3.0