Change from "classic" TS 1.6 imports to the default resolution scheme.

- Use relative imports in place of most of our absolute ones.
- Add "private" ambient modules for modules that we need to import using
an absolute path (e.g. when app/.../test-something.ts needs to import
ui/styling/style-scope)

ui/progress/progress.android.ts

@@ -1,4 +1,4 @@
-import common = require("ui/progress/progress-common");
+import common = require("./progress-common");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
 

ui/progress/progress.ios.ts

@@ -1,4 +1,4 @@
-import common = require("ui/progress/progress-common");
+import common = require("./progress-common");
 import dependencyObservable = require("ui/core/dependency-observable");
 import proxy = require("ui/core/proxy");
 
@@ -30,4 +30,4 @@ export class Progress extends common.Progress {
     get ios(): UIProgressView {
         return this._ios;
     }
-} 
+}