feat(http): add basic http service

This implementation only works in JavaScript, while the Observable transpilation
story gets worked out. Right now, the service just makes a simple request,
and returns an Observable of Response.

Additional functionality will be captured in separate issues.

Fixes #2028

tools/broccoli/trees/browser_tree.ts

@@ -41,6 +41,7 @@ const kServedPaths = [
   'examples/src/forms',
   'examples/src/gestures',
   'examples/src/hello_world',
+  'examples/src/http',
   'examples/src/key_events',
   'examples/src/sourcemap',
   'examples/src/todo',

tools/broccoli/trees/dart_tree.ts

@@ -44,7 +44,16 @@ function stripModulePrefix(relativePath: string): string {
 
 function getSourceTree() {
   // Transpile everything in 'modules' except for rtts_assertions.
-  var tsInputTree = modulesFunnel(['**/*.js', '**/*.ts', '**/*.dart'], ['rtts_assert/**/*']);
+  var tsInputTree = modulesFunnel(['**/*.js', '**/*.ts', '**/*.dart'],
+                                  // TODO(jeffbcross): add http when lib supports dart
+                                  [
+                                    'rtts_assert/**/*',
+                                    'examples/e2e_test/http/**/*',
+                                    'examples/src/http/**/*',
+                                    'angular2/src/http/**/*',
+                                    'angular2/test/http/**/*',
+                                    'angular2/http.ts'
+                                  ]);
   var transpiled = ts2dart(tsInputTree, {generateLibraryName: true, generateSourceMap: false});
   // Native sources, dart only examples, etc.
   var dartSrcs = modulesFunnel(['**/*.dart', '**/*.ng_meta.json', '**/css/**']);