Move code out of package_test.go.
Do not use MgoTestPackage in backups.
Expose backups.StoreArchive.
Set meta.Stored properly.
Move .UTC() into setBackupStored.
testing -> backupstesting.
SHASumFile -> SHA1SumFile.
Merge pull request #992 from ericsnowcurrently/backups-create-set-metadata-stored

Set Stored on stored metadata.

The "stored" timestamp in the DB was set incorrectly.  The value was not set on the metadata at all during create.  Both of these changes should have happened in a previous changeset.

This patch also factors extra code out of state/backups/package_test.go, as well as dropping use of MgoTestPackage within state/backups.
version: Reset version to alpha3

An earlier branch accidentially reverted the version to alpha2,
change it back to alpha3 here.
Merge pull request #1005 from bz2/re_alpha3_1387764

version: Reset version to alpha3

An earlier branch accidentially reverted the version to alpha2,
change it back to alpha3 here.