Create a package for pub itself

[DartBot]

This issue was originally filed by @seaneagan

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I'm building a package which involves reading and writing to pubspecs, and pub's code to represent pubspecs, packages, dependencies etc. in the following files would be quite useful to have access to:

https://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/sdk/lib/_internal/pub/lib/src/package.dart

https://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/sdk/lib/_internal/pub/lib/src/pubspec.dart

It could either be a pub package or multiple pub_\*\*\* packages ala pub_semver.

[sgjesse]

Added Area-Pub, Triaged labels.

[nex3]

We've wanted to make a published "pub" package for a while, but we've never had the time to do so. I'm retargeting this bug to be about that goal in general.

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Changed the title to: "Create a package for pub itself".

[DartBot]

This comment was originally written by @seaneagan

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The pubspec metadata of the current entry point package, and especailly the version would be particularly useful:

dart-archive/usage#13
seaneagan/unscripted#21

[DartBot]

This issue has been moved to dart-lang/pub#1154.