Merge pull request #436 from Hixie/analyzer

Allowing us to have a single error seems silly.

packages/flutter/lib/src/widgets/basic.dart

@@ -749,6 +749,8 @@ class Positioned extends ParentDataWidget {
        top = rect.top,
        width = rect.width,
        height = rect.height,
+       right = null,
+       bottom = null,
        super(key: key, child: child);
 
   final double top;

packages/flutter_tools/lib/src/commands/analyze.dart

@@ -289,10 +289,10 @@ class AnalyzeCommand extends FlutterCommand {
       }
     }
 
-    if (exitCode < 0 || exitCode > 3) // 1 = hints, 2 = warnings, 3 = errors
+    if (exitCode < 0 || exitCode > 3) // 0 = nothing, 1 = hints, 2 = warnings, 3 = errors
       return exitCode;
 
-    if (errorCount > 1)
+    if (errorCount > 0)
       return 1;
     if (argResults['congratulate'])
       print('No analyzer warnings!');