[SPR-8387] Introduced supports(MergedContextConfiguration) method in the SmartContextLoader SPI; updated existing loaders accordingly; and fleshed out implementation of and tests for the new DelegatingSmartContextLoader.

[SPR-8386] ContextLoader resolution once again ignores the inheritLocations flag on @ContextConfiguration.

[SPR-8386] Completed JavaDoc for AnnotationConfigContextLoader regarding the SmartContextLoader SPI.

[SPR-8386] AbstractContextLoader now adheres to the SmartContextLoader contract by verifying the existence of generated default resource locations.

[SPR-8395][SPR-8386] AnnotationConfigContextLoader now generates a list of default configuration classes by finding all non-private, non-final, static, inner classes of the test class that are annotated with @Configuration; updated JavaDoc in AbstractGenericContextLoader and AnnotationConfigContextLoader to reflect changes resulting from the SmartContextLoader integration.

[SPR-8386] Polishing SmartContextLoader SPI; AnnotationConfigContextLoader now only considers static inner classes annotated with @Configuration as configuration classes.

- introduced processContextConfigurationAttributes() method in SmartContextLoader SPI
- refactored AnnotationConfigContextLoader, AbstractContextLoader, AbstractGenericContextLoader, ContextLoaderUtils, and TestContext implementations to take advantage of the SmartContextLoader SPI, MergedContextConfiguration, and ContextConfigurationAttributes
- deleted ResourceTypeAwareContextLoader
- deleted ContextLoaderUtils.LocationsResolver and implementations
- moved context key generation from TestContext to MergedContextConfiguration

Issue: SPR-8426

[SPR-7326] MergedContextConfiguration now ensures that it holds non-null arrays with proper semantics for TestContext's cache key generation.

Suppressing warnings for deprecation of SimpleJdbcTemplate; polishing JavaDoc; using TestNG assertions in TestNG tests.

[SPR-6184] AnnotationConfigContextLoader now defines "$ContextConfiguration" as the resource suffix for generated default @Configuration class names.

[SPR-7960][SPR-8386] Supporting declarative configuration of bean definition profiles in the TestContext framework:
- TextContext now works with MergedContextConfiguration instead of locations and loader
- TextContext now builds context caching key from MergedContextConfiguration
- Test context caching is now based on locations, classes, active profiles, and context loader
- TextContext now delegates to SmartContextLoader or ContextLoader as appropriate
- AbstractContextLoader now implements SmartContextLoader
- AbstractGenericContextLoader now sets active profiles in the GenericApplicationContext 
- Introduced integration tests for profile support in the TCF for both XML and annotation config

[SPR-7960][SPR-8386] First draft of SmartContextLoader SPI, MergedContextConfiguration, and ContextConfigurationAttributes.

Reflecting signature changes in getProperty() methods

- Removed AbstractGenericContextLoader's createGenericApplicationContext() method.
- AnnotationConfigContextLoader now uses an AnnotatedBeanDefinitionReader instead of working with an AnnotationConfigApplicationContext.
- AnnotationConfigContextLoader now uses the supplied GenericApplicationContext to load configuration classes.

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