Edit the AST Class to allow to add a ; on command.

[Hectorhammett]

We currently cannot create resources with the ResourcesGenerator without appending a ; to the toCode method as if we remove the appended semicolon it ends up generating "invalid" code as it is missing the last semicolon.

In this specific case we are using a PhpFile class which inherits from AST. So there is a bit of hoops that we might need to work on in order to make be able to add a semi colon to our files when we need them.

[noahdietz]

relevant discussion: #696 (comment)