#297 - Upgraded to Boot 2.0 and Spring Data Kay.

Bumped version number to 2.0. Upgraded to Spring Boot 2.0.

Stuff disabled in the meantime:

- Cassandra: needs API adaptions in configuration
- JPA > Security: test fails with weird Hibernate error
- Redis > Reactive: API updates needed
- Solr: configration updates necessary

adjust versions

Updated elastic search to the new version.

Fixed the reactor version to Bismuth-BUILD-SNAPSHOT. This probably should be undone when boot references the proper bom.

solr/example/src/test/java/example/springdata/solr/AdvancedSolrRepositoryTests.java

@@ -65,7 +65,7 @@ public class AdvancedSolrRepositoryTests {
 			Product superNES = Product.builder().id("id-3").name("Super Nintendo").popularity(3).build();
 			Product nintendo64 = Product.builder().id("id-4").name("N64").description("Nintendo 64").popularity(2).build();
 
-			repository.save(Arrays.asList(playstation, playstation2, superNES, nintendo64));
+			repository.saveAll(Arrays.asList(playstation, playstation2, superNES, nintendo64));
 		}
 	}