Move bundled libraries out of plugins

editor/docs/README.txt

 Notes about Dart Editor workspace setup, development, build, and deploy.
 
 ====================================
   Installation
 ====================================
 
 * Install Eclipse 3.7  "Eclipse for RCP and RAP Developers" ("Classic" should work as well)
     http://eclipse.org/downloads/
 
 * Install SVN support into Eclipse 3.7
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 and choose Run As > Ant Build (the default option, not the Ant Build... option). This will create
 the closure-compiler/build/compiler.jar library, which will be picked up by the 
 com.google.dart.compiler.js project.
 
 Alternatively, run ant from the third_party/closure_compiler directory.
 
 Refresh the closure-compiler and com.google.dart.compiler.js projects for Eclipse to see the new
 files.
 
 ====================================
+  Building Dart Libraries
+====================================
+
+For development, we require that the Eclipse installation directory have a "libraries" directory
+containing the bundled dart:<name> libraries (e.g. dart:core). To build this directory...
+
+1) Right click on editor/build/build_rcp.xml
+2) Select "Run As > Ant Build..."
+3) Click the "Targets" tab and make sure only the "setupDevWorkspace" target is checked
+4) Click the "JRE" tab and select "Run in the same JRE as the workspace"
+5) Click "Run"
+
+Alternately, you can run the Ant script outside Eclipse
+by defining the "eclipse.home" property to point to your Eclipse installation
+
+====================================
   Launching the Dart Editor
 ====================================
 
 Once your projects have been imported, go to the Package Explorer and open the 
 dart_feature.product file in the com.google.dart.tools.deploy project. Under the
 Testing section, click on the 'Launch an Eclipse Application' link. Another instance of
 Eclipse should launch, running the Dart Editor!
 
 ====================================
   Building the Dart Editor
 ====================================
 
 See the dart/editor/build/README.txt file for build instructions.