pom.xml: remove unused property.

Should be in 682c251 commit.

No functional changes.

Author: php-coder

pom.xml

@@ -76,7 +76,6 @@
 		<servlet-api.version>3.1.0</servlet-api.version>
 		<slf4j.version>1.7.19</slf4j.version>
 		<spock.version>1.0-groovy-2.0</spock.version>
-		<spring-data-releasetrain.version>Dijkstra-SR4</spring-data-releasetrain.version>
 		<thymeleaf.version>2.1.4.RELEASE</thymeleaf.version>
 		<thymeleaf-extras-springsecurity4.version>2.1.2.RELEASE</thymeleaf-extras-springsecurity4.version>