Close repository after each operation

This prevents the tests failing when they try to delete the
.git files, but there is still a file lock (in Snake YAML),
so does not yet fix gh-45.

spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/JGitEnvironmentRepositoryTests.java

@@ -45,7 +45,7 @@ public class JGitEnvironmentRepositoryTests {
 		String uri = ConfigServerTestUtils.prepareLocalRepo();
 		repository.setUri(uri);
 		if (basedir.exists()) {
-			FileUtils.delete(basedir, FileUtils.RECURSIVE);
+			FileUtils.delete(basedir, FileUtils.RECURSIVE | FileUtils.RETRY);
 		}
 	}