Improve RepositoryRestConfiguration customization

This commit binds RepositoryRestConfiguration to the spring.data.rest
prefix so that any of its property can be customized through the
environment.

If a RepositoryRestMvcConfiguration is defined in the context, those
customization do not apply, as it was the case before.

Fixes gh-1171

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -220,6 +220,9 @@ content into your application; rather pick only the properties that you need.
 	spring.data.elasticsearch.local=true # if local mode should be used with client nodes
 	spring.data.elasticsearch.repositories.enabled=true # if spring data repository support is enabled
 
+	# DATA RESET ({spring-data-rest-javadoc}/core/config/RepositoryRestConfiguration.{dc-ext}[RepositoryRestConfiguration}])
+	spring.data.rest.baseUri=foo # base URI against which the exporter should calculate its links
+
 	# FLYWAY ({sc-spring-boot-autoconfigure}/flyway/FlywayProperties.{sc-ext}[FlywayProperties])
 	flyway.locations=classpath:db/migrations # locations of migrations scripts
 	flyway.schemas= # schemas to update

spring-boot-docs/src/main/asciidoc/index.adoc

@@ -33,6 +33,7 @@ Phillip Webb; Dave Syer; Josh Long; Stéphane Nicoll; Rob Winch; Andy Wilkinson;
 :spring-data-javadoc: http://docs.spring.io/spring-data/jpa/docs/current/api/org/springframework/data/jpa
 :spring-data-commons-javadoc: http://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data
 :spring-data-mongo-javadoc: http://docs.spring.io/spring-data/mongodb/docs/current/api/org/springframework/data/mongodb
+:spring-data-rest-javadoc: http://docs.spring.io/spring-data/rest/docs/current/api/org/springframework/data/rest
 :gradle-userguide: http://www.gradle.org/docs/current/userguide
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