Update Version to latest language changes.

utils/pub/version_solver.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Attempts to resolve a set of version constraints for a package dependency
  * graph and select an appropriate set of best specific versions for all
  * dependent packages. It works iteratively and tries to reach a stable
  * solution where the constraints of all dependencies are met. If it fails to
  * reach a solution after a certain number of iterations, it assumes the
@@ skipping 539 matching lines @@
   /** The names of all the packages that depend on this dependency. */
   Collection<String> get dependers => _refs.keys;
 
   /**
    * Gets the overall constraint that all packages are placing on this one.
    * If no packages have a constraint on this one (which can happen when this
    * package is in the process of being added to the graph), returns `null`.
    */
   VersionConstraint get constraint {
     if (_refs.isEmpty) return null;
-    return new VersionConstraint.intersect(
+    return new VersionConstraint.intersection(
         _refs.values.map((ref) => ref.constraint));
   }
 
   /// The source of this dependency's package.
   Source get source {
      var canonical = _canonicalRef();
      if (canonical == null) return null;
      return canonical.source;
   }
 
@@ skipping 153 matching lines @@
   final description1;
   final description2;
 
   DescriptionMismatchException(this.package, this.description1,
       this.description2);
 
   // TODO(nweiz): Dump to YAML when that's supported
   String toString() => "Package '$package' has conflicting descriptions "
     "'${JSON.stringify(description1)}' and '${JSON.stringify(description2)}'";
 }