Fixing the build doc instructions for eclipse.
Fixing the build doc instructions for eclipse.

 * add "extensions"
 * mention that the ant build needs to be run to get the dependencies

git-svn-id: a0353c9e9d8b733b849b8de992d454c6c9c394cb@420601 13f79535-47bb-0310-9956-ffa450edef68

hmrajas/abdera