BATCH-862: created change logs for M1 and M2

src/site/apt/migration/1.1-2.0-m1.apt

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+Spring Batch 2.0-m1 Release Notes
+
+* Bugfixes:
+
+  * [BATCH-737] - JdbcCursorItemReader will spin through entire resultset if numberOfProcessRows=0
+  * [BATCH-732] - FlatFileItemReader doesn't take "firstLineIsHeader" flag into account when restarting
+  * [BATCH-735] - Getting Started page should be updated
+  * [BATCH-734] - ItemReaders and ItemWriters using Resource(s) should check for file during ItemStream#open
+  * [BATCH-778] - MapJobRepositoryFactoryBean shouldn't require transactionManager
+  * [BATCH-693] - Refactor samples along domain contours
+  * [BATCH-761] - StaxEventItemWriter writes extra end document tag with Woodstox 3.2.6
+  * [BATCH-765] - StepExecution should be saved on every commit
+  * [BATCH-757] - remove DelegatingItemWriter
+  * [BATCH-766] - Insufficient error handling in case of a missing resource for a org.springframework.batch.item.xml.StaxEventItemWriter
+  * [BATCH-727] - Move all POMs in trunk to 2.0.0.CI-SNAPSHOT
+  * [BATCH-744] - restart.count is always 0 in FlatFileItemWriter

src/site/apt/migration/2.0-m1-m2.apt

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+Spring Batch 2.0-m2 Release Notes
+
+* Bugfixes:
+
+  * [BATCH-682] - Use SoftReference and/or expiry to store entries in RetryContextCache implementation(s)
+  * [BATCH-764] - Truncate flatfile in restart scenarios.
+  * [BATCH-776] - StaxEventItemWriter headers should not have to be the same type as the T that the writer is parameterised with
+  * [BATCH-782] - Synchronization issue in ItemOrientedStep if exception is throw in chunk processing
+  * [BATCH-790] - SQL error caused by changes to JdbcExecutionContextDao
+  * [BATCH-795] - JdbcJobExecutionDao output sorting
+  * [BATCH-807] - Serialization bug in JobExecution
+  * [BATCH-812] - StepExecutionResourceProxy should use a different JobParametersConverter
+  * [BATCH-813] - SingleColumnJdbcKeyGeneratorIntegrationTests fails in Eclipse