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Create new ChangeLogSerializers by implementing the liquibase.serializer.ChangeLogSerializer interface_._  The following methods are required:

String[] getValidFileExtensions();

Used to determine which serializer to use when a particular output filename is selected.

String serialize(DatabaseChangeLog databaseChangeLog);
String serialize(ChangeSet changeSet);
String serialize(Change change);
String serialize(ColumnConfig columnConfig);

Converts the given LiquiBase Liquibase internal objects into a string.

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1. Create the class as a sub-package of "liquibase.serializer.ext".  LiquiBase Liquibase automatically registers ChangeLogSerialzer it finds in that package
2. Call liquibase.serializer.ChangeLogSerialzerFactory.getInstance().register(serializer)

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