Restore Spring Cloud support in 1.3.x

Based on the work in gh-121 (6df0fd3), Spring Cloud can now be used again
with Spring Boot 1.3.

initializr-service/application.yml

@@ -19,7 +19,12 @@ initializr:
       cloud-bom:
         groupId: org.springframework.cloud
         artifactId: spring-cloud-starter-parent
+        mappings:
+          - versionRange: "[1.2.3.RELEASE,1.3.0.M1)"
             version: Angel.SR3
+          - versionRange: 1.3.0.M1
+            version: Brixton.BUILD-SNAPSHOT
+            repositories: spring-snapshots,spring-milestones
   dependencies:
     - name: Core
       content:
@@ -138,7 +143,7 @@ initializr:
           description: Support for the Elasticsearch search and analytics engine including spring-data-elasticsearch
     - name: Cloud
       bom: cloud-bom
-      versionRange: "[1.2.3.RELEASE,1.3.0.M1)"
+      versionRange: "1.2.3.RELEASE"
       content:
         - name: Cloud Connectors
           id: cloud-connectors