Cleanup for pkg/observe and pkg/polymer

pkg/polymer/pubspec.yaml

 name: polymer
-version: 0.10.0-pre.2
+version: 0.10.0-pre.3.dev
 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: "0.13.0-dev.6"
-  args: ">=0.10.0 <0.11.0"
-  barback: ">=0.9.0 <0.13.0"
-  browser: ">=0.10.0 <0.11.0"
-  html5lib: ">=0.9.2 <0.10.0"
-  logging: ">=0.9.0 <0.10.0"
-  observe: ">=0.10.0-pre.0 <0.11.0"
-  path: ">=0.9.0 <2.0.0"
-  polymer_expressions: ">=0.10.0-pre.0 <0.11.0"
-  smoke: ">=0.1.0-pre.0 <0.2.0"
-  source_maps: ">=0.9.0 <0.10.0"
-  template_binding: ">=0.10.0-pre.0 <0.11.0"
-  web_components: ">=0.3.2 <0.4.0"
-  yaml: ">=0.9.0 <0.10.0"
+  analyzer: 0.13.0-dev.6
+  args: '>=0.10.0 <0.11.0'
+  barback: '>=0.9.0 <0.13.0'
+  browser: '>=0.10.0 <0.11.0'
+  html5lib: '>=0.9.2 <0.10.0'
+  logging: '>=0.9.0 <0.10.0'
+  observe: '>=0.10.0-pre.0 <0.11.0'
+  path: '>=0.9.0 <2.0.0'
+  polymer_expressions: '>=0.10.0-pre.0 <0.11.0'
+  smoke: '>=0.1.0-pre.0 <0.2.0'
+  source_maps: '>=0.9.0 <0.10.0'
+  template_binding: '>=0.10.0-pre.0 <0.11.0'
+  web_components: '>=0.3.2 <0.4.0'
+  yaml: '>=0.9.0 <0.10.0'
+dev_dependencies:
+  unittest: '>=0.10.0 <0.11.0'
 transformers:
 # TODO(sigmund): uncomment when full codegen is ready.
 #- polymer/src/build/remove_mirrors
 #    $include: lib/polymer.dart
 - observe:
     files: lib/src/instance.dart
     # TODO(sigmund): uncomment once $include is available in the stable channel
     # (1.3.0) or when we really need a dependency on the latest dev channel.
     # $include: lib/src/instance.dart
-dev_dependencies:
-  unittest: ">=0.10.0 <0.11.0"
 environment:
-  sdk: ">=1.2.0 <2.0.0"
+  sdk: '>=1.2.0 <2.0.0'