Merge pull request #70 from whatwg/add-roadmap

initial skeleton for roadmap, no text yet

Author: Dave Herman

roadmap.md

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+# Loader Spec: The Road Ahead
+
+![The Road Ahead](http://img.archiwumallegro.pl/?1187401430)
+
+## Stage 0: Basic Static Loading
+
+- Name resolution (relative URLs, maybe absolute URLs)
+- Fetch integration
+- <script type="module">
+- memoization
+
+## Stage 1: Basic Dynamic Loading
+
+- Worker invocation API
+- Dynamic (async) import API
+- Module instance object reflection
+- Relative import syntax (`import local from this;`)
+
+## Stage 2: Extensibility
+
+- registry reflection
+- loading pipeline hooks
+
+## Stage 3: Conveniences
+
+- Site packages
+