Issue #1142: sanitize the class name for Java model classes.

This builds on #1139, calling the new sanitizeName() method before camelizing it when generating model names.

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavaClientCodegen.java

@@ -237,6 +237,8 @@ public class JavaClientCodegen extends DefaultCodegen implements CodegenConfig {
 
     @Override
     public String toModelName(String name) {
+        name = sanitizeName(name);
+
         // model name cannot use reserved keyword, e.g. return
         if (reservedWords.contains(name)) {
             throw new RuntimeException(name + " (reserved word) cannot be used as a model name");