Rename "Local" to "Name" when referring to variables during compilation

* Variables were previously named "Local"s because they described a
  local variable - however, this is kind of a misnomer because it
  handles globals as well. This has been changed pretty much everywhere
  when appropriate (hopefully).
* Renamed obj/names.rs to obj/reserved.rs, freeing up the "names" module
  for the new Names handle
* Renamed obj/locals.rs to obj/names.rs, see above

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/ast.rs

@@ -75,7 +75,7 @@ impl<V: Visit<Out=()>> DefaultAccept<V> for AssignStmt {
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum LhsExpr {
     SetAttr(AccessExpr),
-    Local(String),
+    Name(String),
 }
 
 //
@@ -94,7 +94,7 @@ impl<V: Visit<Out=()>> DefaultAccept<V> for LhsExpr {
     fn default_accept(&self, visitor: &mut V) -> V::Out {
         match self {
             LhsExpr::SetAttr(a) => a.accept(visitor),
-            LhsExpr::Local(_) => {},
+            LhsExpr::Name(_) => {},
         }
     }
 }