Updated DSL docs for ivy publication
Updated ivy-publish samples
- Split into 3 separate samples
- Made java multiproject sample a bit clearer
- Have not yet updated userguide for these changes
Updated "publishing ivy" chapter of the user guide for recent changes
Updated release notes for new features in the ivy-publish plugin
Fixed IvyPublishCrossVersionIntegTest
- Gradle versions prior to 1.0-milestone-7 don't support ivy() repository with space in artifact pattern,
  so use Ivy FileSystemResolver directly instead for these versions