Make pkg/path 1.0.0 and upgrade dependencies appropriately.

pkg/polymer/pubspec.yaml

 name: polymer
-version: 0.9.1+1
+version: 0.9.2
 author: Polymer.dart Authors <web-ui-dev@dartlang.org>
 description: >
   Polymer.dart is a new type of library for the web, built on top of Web
   Components, and designed to leverage the evolving web platform on modern
   browsers.
 homepage: https://www.dartlang.org/polymer-dart/
 dependencies:
   analyzer: ">=0.10.1 <0.11.0"
   args: ">=0.9.0 <0.10.0"
   barback: ">=0.9.0 <0.11.0"
   browser: ">=0.9.0 <0.10.0"
   csslib: ">=0.9.0 <0.10.0"
   custom_element: ">=0.9.0 <0.10.0"
   html5lib: ">=0.9.1 <0.10.0"
   html_import: ">=0.9.0 <0.10.0"
   logging: ">=0.9.0 <0.10.0"
   observe: ">=0.9.1 <0.10.0"
-  path: ">=0.9.0 <0.10.0"
+  path: ">=0.9.0 <2.0.0"
   polymer_expressions: ">=0.9.1 <0.10.0"
   shadow_dom: ">=0.9.1 <0.10.0"
   source_maps: ">=0.9.0 <0.10.0"
   template_binding: ">=0.9.0 <0.10.0"
   yaml: ">=0.9.0 <0.10.0"
 transformers:
 - observe:
     files: lib/src/instance.dart
 dev_dependencies:
   unittest: ">=0.9.0 <0.10.0"
 environment:
   sdk: ">=1.0.0 <2.0.0"