Merge pull request #33 from ajordens/support-disabling-cassandra

Support explicitly disabling Cassandra

Author: ajordens

kork-cassandra/src/main/java/com/netflix/spinnaker/kork/astyanax/AstyanaxComponents.java

@@ -51,7 +51,7 @@
 
 @Configuration
 @EnableConfigurationProperties
-@ConditionalOnClass(AstyanaxConfiguration.class)
+@ConditionalOnExpression("${cassandra.enabled:true}")
 public class AstyanaxComponents {
 
     @Value("${cassandra.host:127.0.0.1}")