Rewire the pubspecs to use local paths

Using local paths ensures that each package sees each other package at HEAD.

packages/flx/pubspec.yaml

diff --git a/packages/flx/pubspec.yaml b/packages/flx/pubspec.yaml
index 56e9fc0..3b8517a 100644
--- a/packages/flx/pubspec.yaml
+++ b/packages/flx/pubspec.yaml
@@ -2,14 +2,14 @@
 version: 0.0.10
 author: Flutter Authors <flutter-dev@googlegroups.com>
 description: Library for dealing with Flutter bundle (.flx) files
-homepage: http://flutter.io
+homepage: https://github.com/flutter/flutter/tree/master/packages/flx
 dependencies:
-  sky_services: 
-    '0.0.50'
-  yaml: ^2.1.3
   asn1lib: ^0.4.1
   cipher: ^0.7.1
   crypto: ^0.9.1
   path: ^1.3.0
+  sky_services: 0.0.50
+  yaml: ^2.1.3
+
 environment:
   sdk: '>=1.12.0 <2.0.0'