Alteration of the changelogs to new formatation with retro-compatibility


1. Stract of changeset to simgle file per changeset, keeping the authros and the ids
2. Alteration of the changelog.xml to include and run the new files
3. Add retro-compatibility so the already running yougi's wont broke

Observations
* logicalFilePath: The before running a file, the liquibase checks the changeSet id the author and the file, for now this verification can't be disabled, the attribute logicalFilePath says to the changeSet that the actual file that will be saved in the table DATABASECHANGELOG will be the one informed, so when it run the verifications it will see the same file as was before.
* validCheckSum: The second check of liquibase is the content of the file, he generate a MD5  with the content of the file, and will be checked on the table DATABASECHANGELOG where the id,author and file are the same. So the tag validCheckSum says that the current content of the file is valid, this is very important and the files can't be changed.
* The new files can be included as the old way, using <include>