Bring in the latest version of pub.

CHANGELOG.md

 ## 1.14.0
 
 ### Core library changes
 * `dart:convert`
   * `Base64Decoder.convert` now takes optional `start` and `end` parameters.
 
 * `dart:core`
   * Added `current` getter to `StackTrace` class.
   * Added `Uri.data` getter for `data:` URIs, and `UriData` class for the
     return type.
   * Added `growable` parameter to `List.filled` constructor.
 
 * `dart:math`
   * `Random` added a `secure` constructor returning a cryptographically secure
     random generator which reads from the entropy source provided by the
     embedder for every generated random value.
 
 * `dart:io`
   * `Platform` added an `isiOS` getter and `Platform.operatingSystem` may now
     return `ios`.
 
+### Tool changes
+
+* Pub
+
+  * **Breaking:** Pub now eagerly emits an error when a pubspec's "name" field
+    is not a valid Dart identifier. Since packages with non-identifier names
+    were never allowed to be published, and some of them already caused crashes
+    when being written to a `.packages` file, this is unlikely to break many
+    people in practice.
+
+  * `pub serve` now GZIPs the assets it serves to make load times more similar
+    to real-world use-cases.
+
+  * `pub deps` now supports a `--no-dev` flag, which causes it to emit the
+    dependency tree as it would be if no `dev_dependencies` were in use. This
+    makes it easier to see your package's dependency footprint as your users
+    will experience it.
+
+  * `pub global run` now detects when a global executable's SDK constraint is no
+    longer met and errors out, rather than trying to run the executable anyway.
+
+  * Fixed a crashing bug when using `pub global run` on a global script that
+    didn't exist.
+
+  * Fixed a crashing bug when a pubspec contains a dependency without a source
+    declared.
+
 ## 1.13.0 - 2015-11-18
 
 ### Core library changes
 * `dart:async`
   * `StreamController` added getters for `onListen`, `onPause`, and `onResume`
     with the corresponding new `typedef void ControllerCallback()`.
   * `StreamController` added a getter for `onCancel` with the corresponding
     new `typedef ControllerCancelCallback()`;
   * `StreamTransformer` instances created with `fromHandlers` with no
     `handleError` callback now forward stack traces along with errors to the
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     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.