[VarDumper] json dumper for interoperable displaying
[VarDumper] tests for JsonDumper
[VarDumper] tests for CliDumper
[VarDumper] tests for HtmlDumper
[VarDumper] README, LICENSE and composer.json
[DebugBundle] global debug() function for daily use
[DebugBundle] show debug() excerpt in the toolbar
[DebugBundle] Inlined assets to avoid installation issues
Added a javascript representation of the json spec and its renderer.