IN PROGRESS - issue BATCH-521: Create migration guide for rc1->1.0

http://jira.springframework.org/browse/BATCH-521

draft added (not linked from site)

src/site/apt/migration/1.0-rc1-final.apt

@@ -0,0 +1,26 @@
+			             ------
+                         Spring Batch Upgrade
+                         ------
+                         Robert Kasanicky
+                         ------
+                         March 2008
+
+Updating Spring Batch jobs from 1.0.0.rc1 to 1.0.0.final framework
+
+ Migrating from rc1 to final release does not require configuration changes. Following is a list of notable imporovements and/or changes in behavior.
+
+  * SimpleStepFactoryBean defaults to commit interval = 1
+
+  * SkipLimitStepFactoryBean accepts a list of fatal exceptions (java.lang.Error by default) that cause immediate step failure, regardless of skippable settings.
+
+  *  skip and retry are no longer exclusive, StatefulRetryStepFactoryBean extends SkipLimitStepFactoryBean.
+
+  * exception on read does not cause transaction rollback if the exception is skippable.
+
+  * checked skippable exceptions are skipped correctly
+
+  * FlatFileItemWriter buffers output and writes to file only on flush() i.e. at the end of chunk.
+
+  * ExitStatusExceptionClassifier interface removed - SimpleExitStatusExceptionClassifier implements JobListener instead.
+  
+  * ExecutionContext is persisted for the first time before the processing of first chunk starts, so the scenario when job fails before first chunk is commited is no longer special.