ResourceServlet logs warnings about .map files

When Angular-based UI components are opened, the resource servlet logs various warnings about .map files. Steps to reproduce:

1. login to the archetype CMS
2. edit the only channel
3. click the 'edit menu' button

Expected: no warnings in the logs
Actual: the following warnings are logged:

[INFO] [talledLocalContainer] 19.03.2014 16:46:54 WARN http-bio-8080-exec-19 [ResourceServlet.prepareResponse:450] No mime-type mapping for resource path: file:/home/mathijs/projects/hippo/archetype/website/target/gettingstarted/target/tomcat7x/webapps/cms/WEB-INF/lib/hippo-addon-channel-manager-frontend-2.25.03-SNAPSHOT.jar!/angular/components/jquery/jquery.min.map. Fallback to 'application/octet-stream'.
[INFO] [talledLocalContainer] 19.03.2014 16:46:54 WARN http-bio-8080-exec-5 [ResourceServlet.prepareResponse:450] No mime-type mapping for resource path: file:/home/mathijs/projects/hippo/archetype/website/target/gettingstarted/target/tomcat7x/webapps/cms/WEB-INF/lib/hippo-addon-channel-manager-frontend-2.25.03-SNAPSHOT.jar!/angular/components/angular-route/angular-route.min.js.map. Fallback to 'application/octet-stream'.
[INFO] [talledLocalContainer] 19.03.2014 16:46:54 WARN http-bio-8080-exec-19 [ResourceServlet.prepareResponse:450] No mime-type mapping for resource path: file:/home/mathijs/projects/hippo/archetype/website/target/gettingstarted/target/tomcat7x/webapps/cms/WEB-INF/lib/hippo-addon-channel-manager-frontend-2.25.03-SNAPSHOT.jar!/angular/components/underscore/underscore-min.map. Fallback to 'application/octet-stream'.