[BUGFIX] remove abstract method execute()

Fatal error: Can't inherit abstract function
Tx_Smoothmigration_Domain_Interface_Processor::execute() (previously
declared abstract in
Tx_Smoothmigration_Migrations_AbstractMigrationProcessor) in
[TASK] remove semicolon behind the require_once's
Merge pull request #1 from mario-naether/master

merge master to branch for  6.2