Move sky/examples to sky/sdk/lib/example, and code changes to support that change. Fixes T277.

sky/examples/README.md

Index: sky/examples/README.md
diff --git a/sky/examples/README.md b/sky/examples/README.md
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-Sky Examples
-============
-
-This directory contains several examples of using Sky.  Each of these is an
-individual Dart application package.  If you wish to run them with `sky_tool`
-then you will want to run `pub get` inside their directory before running
-`./packages/sky/sky_tool start`.
-
-1. *Hello, world.* The [hello world app](hello_world) is a basic app that shows
-   the text "hello, world."
-
-2. *Stocks.* The [stocks app](stocks) is an example of a typical mobile app
-   built using Sky. The app shows a list of all the stocks in the NASDAQ.
-
-3. *Widgets.* The [widgets app](widgets) contains a number of Sky widgets so
-   you can experiment with them in a simple container.