added DataSourceFactory strategy; promoted EmbeddedDatabaseConfigurer strategy to public API; added ability to add any number of SQL scripts for db population

embedded database support initial commit; moved from spring-test; ResourceDatabasePopulator duplicate code with test.jdbc package that needs review

revised support for annotated factory methods (merged @FactoryMethod functionality into JavaConfig facility)

+ created example.scannable package to house scannable components away from .context.annotation package
+ example.scannable will also lend itself to sharing via externals