Fix vool assignments after call rework

also small fix for if and return, as they need to execute sneds and yields (not just sends), so testing for Call not SendStatement

lib/vool/statements.rb

@@ -2,7 +2,18 @@ module Vool
   class Statements < Statement
     attr_reader :statements
     def initialize(statements)
-      @statements = statements
+      case statements
+      when nil
+        @statements = []
+      when Array
+        @statements = statements
+      when Statement
+        @statements = statements.statements
+      when Statement
+        @statements = [statements]
+      else
+        raise "Invalid class, must be Statement or Array, not #{statements.class}"
+      end
     end
 
     def empty?
@@ -24,7 +35,11 @@ module Vool
       @statements[i]
     end
     def <<(o)
-      @statements << o
+      if(o.is_a?(Statements))
+        o.each {|s| @statements << s }
+      else
+        @statements << o
+      end
       self
     end
     def prepend(o)