import
use variable
Renamed getters
fix PMD error
ignore one warnings
introduce and use tag
commit as is
TODO: update
updated copyright
pom.xml(liquibase-maven-plugin): output SQL statements to stdout.

Now liquibase:updateSQL and liquibase:rollbackSQL will write its
output to stdout instead of file inside target/ directory.
added db migration support
TODO: +1
unbreak unit tests
fixed warnings from checkstyle
TODO.price: updated
price must be > 0
TODO: -1