I am trying to follow http://primefaces.org/themes to get it working.
All community themes are also available in \"all-in-one\" package.
Version 1.0.10 does not seem to be available at the moment. You can follow this link to see the latest version: http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.primefaces.extensions%22%20AND%20a%3A%22all-themes%22
I had this same issue. I fixed it by changing my dependency in my pom.xml file to:
org.primefaces.extensions
all-themes
1.0.8
Because version 1.0.8 is the latest version I got what I needed. The only difference between what I have and what you have is the the groupId. After changing your groupId and doing a Maven update it worked fine.