+ add NPE test

+ add handling for null arguments to prevent NPE in default key generation

SPR-6922 deprecated SimpleJdbcTemplate/SimpleJdbcOperations/SimpleJdbcDaoSupport in favor of JdbcTemplate/NamedParameterJdbcTemplate and related interfaces support classes

SPR-6416, adding basic conversation object tests, improving the access time of the conversation object

[SPR-6184] completed JavaDoc for AnnotationConfigContextLoader; polished JavaDoc for other concrete context loaders.

[SPR-6184] added tests to verify support for @Configuration classes with TestNG; simplified existing TestNG tests using Spring 3.0 and 3.1 features.

Updated Eclipse code formatter settings for use with STS 2.6. Specifically, format_javadoc_comments=false, which requires that JavaDoc be formatted manually.