LIQUIBASE - Fail task if liquibase has failed

Task must fail if liquibase returned code is not ok
LIQUIBASE - Add an optional changelog path

Add an optional variable to specify a changelog path.
LIQUIBASE - Add an option to log generated SQL

add an option to log generated SQL script in a separated folder.
LIQUIBASE - dos2unix on sh templates

DOS new line character was causing problem when running the generated sh script on an unix os.
LIQUIBASE - Removed changelog path
After discussing wiht alexvictoor we decided the feature was too specific for our project and to remove it.
If the changelog path is not convenient, users can simply rewrite the path with another tool such as ant or maven before packaging the dar.
Merge pull request #1 from RaphaelBrugier/master

Various fixes on liquibase plugin to make it runnable on a linux server