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)

image-source/image-source.android.ts

@@ -1,7 +1,7 @@
 import types = require("utils/types");
 import fs = require("file-system");
 import definition = require("image-source");
-import common = require("image-source/image-source-common");
+import common = require("./image-source-common");
 import enums = require("ui/enums");
 import utils = require("utils/utils");
 
@@ -114,4 +114,4 @@ function getTargetFromat(format: string): android.graphics.Bitmap.CompressFormat
         default:
             return android.graphics.Bitmap.CompressFormat.PNG;
     }
-}
+}

image-source/image-source.ios.ts

@@ -1,7 +1,7 @@
 import definition = require("image-source");
 import types = require("utils/types");
 import fs = require("file-system");
-import common = require("image-source/image-source-common");
+import common = require("./image-source-common");
 import enums = require("ui/enums");
 
 global.moduleMerge(common, exports);