Support using @GrailsComponentScan to customize GORM @Entity scanning locations

[rainboyan]

You can customize entity scanning locations by using the @GrailsComponentScan annotation,

@CompileStatic
@GrailsComponentScan(basePackages = ['grace.apps', 'grace.others'])
class Application {

    static void main(String[] args) {
        Grails.run(Application, args)
    }

}