BATCH-1863: The batch namespace can not be used with allowBeanDefinitionOverriding=false
Deleting an unnecessary import class in ExecutionContext.
"import org.springframework.util.Assert;"
Add BeanCreationException to list of standard failure exceptions

Without this change, when passing an invalid job parameter to a bean
that is created internally by Spring Batch will cause a
BeanCreationException that is essentially ignored.  Due to it being
ignored, an infinite loop occurs in processing.
Change ClassifierCompositeItemWriter to honor item order

The ClassifierCompositeItemWriter loops through the items passed to the
write method twice.  The first time to classifier each item.  The second
tiem to perform the actual writes (this prevents the unnecessicary IO if
an error occurs during classification).  A HashMap was previously used
to hold the classified items (key to the writer : item) however this
causes the items to be written out of order.  This update changes it to
a LinkedHashMap to honor the order the items come in.
Added test to DelimitedLineTokenizer based on StackOverflow Question

A question was asked on StackOverflow
(http://stackoverflow.com/questions/25914945/spring-batch-delimitedlinetokenizer-with-line-breaks-newline-in-csv)
in which a row wasn't being parsed as expected.  We didn't have a test
for that specific scenario so this commit adds one.