public String getScript() {
		return script;
	}
A standard mixin for modules that do some transformation based on a script.
Provides the following options:
<ul>
    <li>script</li>
    <li>propertiesLocation</li>
    <li>variables</li>
</ul>

@author David Turanski
@author Gary Russell
spring-xd-module-spi/src/main/java/org/springframework/xd/module/options/mixins/ScriptMixin.java