Move analysis_server package to own github repo

[DartBot]

This issue was originally filed by @seaneagan

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I understand that the dart repo will be moving to github soon anyways, but it will still make sense for the analysis server to have it's own repo there:

https://code.google.com/p/dart/source/browse/#svn%2Fbranches%2Fbleeding_edge%2Fdart%2Fpkg%2Fanalysis_server

This would make it much easier for me to add pubspec-related functionality from den to it, see:

seaneagan/den#17

[bwilkerson]

I expect that we will do this fairly soon.

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Removed Priority-Unassigned label.
Added Priority-Medium, Area-Analyzer, Analyzer-Server, Triaged labels.

[DartBot]

This comment was originally written by @seaneagan

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Any milestone estimate for this one?

[bwilkerson]

No, and it's less clear to me that we will be doing this.

[bwilkerson]

I think it's safe to say that we won't be doing this. Having code outside the sdk repo that is tightly coupled to code inside it reduces our velocity.