use gopkg.in/mgo.v2/bson
Merge pull request #29 from rogpeppe/007-use-gopkg.in-mgo

use gopkg.in/mgo.v2/bson
charm: refactor URL vs Reference

This is a breaking change so move package path to charm.v3.
charm: add bson marshaling for Reference, and extra tests
Merge pull request #31 from rogpeppe/008-refactor-reference

charm: refactor URL vs Reference
charm: better error checking in ParseURL
Merge pull request #32 from rogpeppe/009-parseURL-error

charm: better error checking in ParseURL
testing: use repo path that does not need updating when import path changes
Merge pull request #33 from rogpeppe/010-stable-repo-path

testing: use repo path that does not need updating when import path changes
charm: add ReadCharmArchiveFromReader and ReadBundleArchiveFromReader
charm: close files in tests
Merge pull request #35 from rogpeppe/011-ReadCharmArchiveFromReader

charm: add ReadCharmArchiveFromReader and ReadBundleArchiveFromReader