Introduced a SnapshotApplicationEvent extending Spring ApplicationEvent to allow SDG-based GemFire applications to trigger GemFire Cache Region data snapshots (export ops).
Refactored SnapshotServiceFactoryBean to be a ApplicationListener on SnapshotApplicationEvents.
Introduced ExportSnapshotException and ImportSnapshotException to more succinctly desribe the snapshot import/export error.
Refactored CacheSnapshotServiceAdapter.doImport(..) method to invoke load(:SnapshotFormat, :SnapshotOptions, :File...), i.e. file-based in order to apply the SnapshotFilter on load, which is not applicable to the CacheSnapshotService.load(:File, :SnapshotFormat) method that assumes the 'File' is a directory. Therefore doImport(..) expands the directory if the File given is indeed a valid file system directory.
Added additional unit tests.
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