chore(pubspec): bump SDK version (>= 1.4.0)

Closes #1009

pubspec.lock

@@ -24,7 +24,7 @@ packages:
   code_transformers:
     description: code_transformers
     source: hosted
-    version: "0.1.3"
+    version: "0.1.3+1"
   collection:
     description: collection
     source: hosted
@@ -36,7 +36,7 @@ packages:
   guinness:
     description: guinness
     source: hosted
-    version: "0.1.3"
+    version: "0.1.4"
   html5lib:
     description: html5lib
     source: hosted

pubspec.yaml

@@ -11,7 +11,7 @@ authors:
 description: Angular for dart.
 homepage: https://angulardart.org
 environment:
-  sdk: '>=1.3.0'
+  sdk: '>=1.4.0'
 dependencies:
   args: '>=0.10.0 < 0.11.0'
   analyzer: '>=0.13.0 <0.14.0'

test/core/scope_spec.dart

@@ -1291,13 +1291,7 @@ void main() {
 
       it('should properly watch array of fields 3', (RootScope rootScope, Logger log) {
         rootScope.context['foo'] = 'abc';
-        String expression = 'foo.contains("b")';
-        if (identical(1, 1.0)) { // dart2js
-          // The previous expression does not work in dart2js (http://dartbug.com/18673)
-          // Use a working one for now.
-          expression = 'foo.contains("b", 0)';
-        }
-        rootScope.watch(expression, (v, o) => log([v, o]));
+        rootScope.watch('foo.contains("b")', (v, o) => log([v, o]));
         expect(log).toEqual([]);
         rootScope.apply();
         expect(log).toEqual([[true, null]]);