~wallyworld/juju-core/1304742-backport-1.18

Viewing all changes in revision 2248.1.46.

[r=thumper] Add errgo as a dep, and start using it.

errgo adds the ability to capture the location of
the error creation or annotation. Annotated errors
don't lose the original error.

https://codereview.appspot.com/59930043/

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