First cut at foreword and Groovy 2.3 section.
minor formatting.
Add ComponentMetadataHandler to the DSL ref.
Fix Javadoc formatting.
This doesn't need to be in the DSL ref.
Release notes for ivy extra info.
Release notes for plugins.withId()
Ivy extra info feature is incubating.
Release notes for pom profile activation.
Release notes for withArguments() method on command line tools.
Release notes for gcc toolchain target support.
Release notes for ivy repository layout.
No promoted features.
Release notes for code quality tool updates.
No deprecations in 2.0.
Minor changes to breaking changes in release notes.
Mention the Ben McCann contributed the ivy repo layout.
Break some long lines.