Add repository declaration to starter parent

Fixes spring-projectsgh-117.

Author: Dave Syer

spring-boot-starters/spring-boot-starter-parent/pom.xml

@@ -311,4 +311,15 @@
 			</plugins>
 		</pluginManagement>
 	</build>
+	<repositories>
+		<!-- TODO: remove this once all milestone dependencies are removed -->
+		<repository>
+			<id>spring-milestones</id>
+			<name>Spring Milestones</name>
+			<url>http://repo.springsource.org/milestone</url>
+			<snapshots>
+				<enabled>false</enabled>
+			</snapshots>
+		</repository>
+	</repositories>
 </project>