I noticed that my project was broken today as well...
Look at this commit from 9 days ago:
https://github.com/spring-projects/spring-data-rest/commit/4ee1850a37f95ae35152c04b94a65171c3593036
As you can see PropertyHandler(s) changed to SimplePropertyHandler(s).
Adding this maven dependency fixed the issue for me:
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons</artifactId>
<version>1.7.0.M1</version>
</dependency>