renameing to match expressions

test/cases/if_statement/if_else.tst

@@ -0,0 +1,14 @@
+if(0)
+  42
+else
+  667
+end
+-- -- --
+s(:expressions,
+  s(:if,
+    s(:condition,
+      s(:int, 0)),
+    s(:if_true,
+      s(:int, 42)),
+    s(:if_false,
+      s(:int, 667))))

test/cases/if_statement/if_else_expressions.tst

@@ -0,0 +1,25 @@
+if(3 > var)
+  Object.initialize(3)
+else
+  var.new(33)
+end
+-- -- --
+s(:expressions,
+  s(:if,
+    s(:condition,
+      s(:operator,  ">",
+        s(:int,  3),
+        s(:name,  :var))),
+    s(:if_true,
+      s(:call,
+        s(:name,  :initialize),
+        s(:arguments,
+          s(:int,  3)),
+        s(:receiver,
+          s(:module,  "Object")))),
+    s(:if_false,   s(:call,
+  s(:name,  :new),
+  s(:arguments,
+    s(:int,  33)),
+  s(:receiver,
+    s(:name,  :var))))))