liquibase task fails with gradle 1.10

* What went wrong:
Execution failed for task ':diff'.
> No signature of method: com.augusttechgroup.gradle.liquibase.LiquibaseTask_Decorated.runLiquibase() is applicable for argument types: (com.augusttechgroup.gradle.liquibase.Activity) values: [com.aug
usttechgroup.gradle.liquibase.Activity@3ef3aec8]
Merge pull request #14 from Catalysts/master

liquibase task fails with gradle 1.10