Copy legal files in maven build, cleanup build script

* Use ant task for copying legal files into repository.
  This must be done in prepare-package. If it's done in package,
  the files are not included in the zip, if it's done too early,
  the target/repository directory is overwritten.
  I've opened bug 424691 to request a config option in tycho to
  include those files.

* Clean up obsolete steps from build file
  - cleanup workspace - now done by the hudson jobs
  - clean up local Maven repository - every hudson job starts with
    a new Maven repo now
  - Obsolete signing steps - signing and pack200 is now done on a
    per-plug-in basis using CBI plugins
  - Include legal files in zip

* Remove README. This file contained mostly obvious information
  and was even wrong in suggesting to use `mvn clean package`
  which will skip tests.
  It will be replaced by a top-level README file (bug 424687).

Change-Id: I41f7ec5933ab4734fcc3780dc08e0a74135dd02a
3 files changed
tree: c6341ea7d80fa440bb512574a4192926986ceb56
  1. bundles/
  2. features/
  3. releng/
  4. tests/
  5. .gitignore