BATCH-1918: First effort at @EnableBatchProcessing

Example:

    @Configuration
    @EnableBatchProcessing
    public class RetrySampleConfiguration {

      @Autowired
      private JobBuilderFactory jobs;

      @Autowired
      private StepBuilderFactory steps;

      @Bean
      public Job retrySample() throws Exception {
        return jobs.get("retrySample").start(step()).build();
      }

      @Bean
      protected Step step() throws Exception {
        return steps.get("step").<Trade, Object> chunk(1).reader(reader()).writer(writer()).faultTolerant()
          .retry(Exception.class).retryLimit(3).build();
      }

      @Bean
      protected ItemReader<Trade> reader() {
        GeneratingTradeItemReader reader = new GeneratingTradeItemReader();
        reader.setLimit(10);
        return reader;
      }

      @Bean
      protected ItemWriter<Object> writer() {
        return new RetrySampleItemWriter<Object>();
      }

    }

spring-batch-samples/src/main/resources/jobs/tradeJob.xml

@@ -2,8 +2,11 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xmlns:p="http://www.springframework.org/schema/p"
+	xmlns:batch="http://www.springframework.org/schema/batch"
 	xsi:schemaLocation="http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.1.xsd
 		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+		
+	<batch:job-repository />
 
 	<job id="tradeJob" xmlns="http://www.springframework.org/schema/batch">
 		<step id="step1" next="step2">