[Specs] Remove all the obsolete specs.

sky/specs/script.md

-Sky Script Language
-===================
-
-The Sky script language is Dart.
-
-The way that Sky integrates the module system with its script language
-is described in [modules.md](modules.md).
-
-All the APIs defined in this documentation, unless explicitly called
-out as being in a framework, are in the `dart:sky` built-in module.
-
-When a method in `dart:sky` defined as ``external`` receives an
-argument, it must type-check it, and, if the argument's value is the
-wrong type, then it must throw an ArgumentError as follows:
-
-   throw new ArgumentError(value, name: name);
-
-...where "name" is the name of the argument. Type checking here
-includes rejecting nulls unless otherwise indicated or unless null is
-argument's default value.
-
-The following definitions are exposed in ``dart:sky``:
-
-```dart
-import 'dart:mirrors';
-
-abstract class AutomaticMetadata {
-  const AutomaticMetadata();
-  void init(DeclarationMirror target, Module module, ScriptElement script);
-
-  static void runLibrary(LibraryMirror library, Module module, ScriptElement script) {
-    library.declarations.values.toList() /* ..sort((DeclarationMirror a, DeclarationMirror b) {
-      bool aHasLocation;
-      try {
-        aHasLocation = a.location != null;
-      } catch(e) {
-        aHasLocation = false;
-      }
-      bool bHasLocation;
-      try {
-        bHasLocation = b.location != null;
-      } catch(e) {
-        bHasLocation = false;
-      }
-      if (!aHasLocation)
-        return bHasLocation ? 1 : 0;
-      if (!bHasLocation)
-        return -1;
-      if (a.location.sourceUri != b.location.sourceUri)
-        return a.location.sourceUri.toString().compareTo(b.location.sourceUri.toString());
-      if (a.location.line != b.location.line)
-        return a.location.line - b.location.line;
-      return a.location.column - b.location.column;
-    }) */
-    ..forEach((DeclarationMirror d) {
-      d.metadata.forEach((InstanceMirror i) {
-        if (i.reflectee is AutomaticMetadata)
-          i.reflectee.run(d, module, script);
-      });
-    });
-  }
-}
-
-class AutomaticFunction extends AutomaticMetadata {
-  const AutomaticFunction();
-  void init(DeclarationMirror target, Module module, ScriptElement script) {
-    assert(target is MethodMirror);
-    MethodMirror f = target as MethodMirror;
-    assert(!f.isAbstract);
-    assert(f.isRegularMethod);
-    assert(f.isTopLevel);
-    assert(f.isStatic);
-    assert(f.parameters.length == 1);
-    assert(f.parameters[0].type == ScriptElement);
-    assert(f.returnType == currentMirrorSystem().voidType);
-    (f.owner as LibraryMirror).invoke(f.simpleName, [script]);
-  }
-}
-const autorun = const AutomaticFunction();
-```
-
-Extensions
-----------
-
-The following as-yet unimplemented features of the Dart language are
-assumed to exist:
-
-* It is assumed that a subclass can define a constructor by reference
-  to a superclass' constructor, wherein the subclass' constructor has
-  the same arguments as the superclass' constructor and does nothing
-  but invoke that superclass' constructor with the same arguments. The
-  syntax for defining this is, within the class body for a class
-  called ClassName:
-
-```dart
-     ClassName = SuperclassName;
-     ClassName.namedConstructor = SuperclassName.otherNamedConstructor;
-```
-
-* The reflection APIs (`dart:mirrors`) are assumed to reflect a
-  library's declarations in source order.