Initial REST API search support for a book by its title

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/java/com/fjordtek/bookstore/model/BookRepository.java

@@ -2,15 +2,21 @@
 
 package com.fjordtek.bookstore.model;
 
+import java.util.List;
 import java.util.Optional;
 
 import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
+import org.springframework.data.rest.core.annotation.RepositoryRestResource;
 
+@RepositoryRestResource
 public interface BookRepository extends CrudRepository<Book, Long> {
 
 	@Override
 	public Optional<Book> findById(Long id);
 
+	public List<Book> findByTitle(@Param("title") String title);
+
 	/* Assume a single book with a single ISBN, or multiple books with possibly duplicate ISBNs?
 	 * For meanwhile, we have a UNIQUE constraint for ISBN values. If this policy changes,
 	 * this method must be changed, as well. Since database allows only UNIQUE values for ISBNs