Implement ruby logical statement

[rubydesign]

From the Ruby::LogicalStatement class

Logical Statements are guaranteed to return boolean either :and or :or, which may be written as && and ||

Also they guarantee that the right expression does not get evaluated if the whole expression fails on the left expression. ie: false && non_existant_method will never call the non_existant_method , but instead evaluate to false

Vool has no concept of this, so the Statement is expanded into the if that it really is