Fixed the base class name

without this change for convention class names we haven't escaped illegal chars
with this change the illegal chars are escaped and no compilation issues occur

fixes #137

samples/standalone/contracts/com/example/server/pom.xml

@@ -13,7 +13,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>1.4.0.BUILD-SNAPSHOT</version>
+		<version>1.4.2.BUILD-SNAPSHOT</version>
 		<relativePath />
 	</parent>