use the mgo built in remove rather than a custom one
added comment regarding the use of mgo.Remove to cleanup metrics
Merge pull request #681 from mattyw/delete-metric-batch-bulk

use the mgo built in remove rather than a custom one

Previously we had our own function for deleting a metric batch during the Cleanup call. All we need to do is delete metrics based on a certain selection so we can just use collection.Remove() from mgo.
apiserver: more logging in tools download GET handler
Merge pull request #718 from axw/tools-download-moar-logging

apiserver: more logging in tools download GET handler

This is to help diagnose https://bugs.launchpad.net/juju-core/+bug/1367431
Mock out lumberjack config for tests.
Update to latest juju/testing.
Merge pull request #720 from howbazaar/update-juju-testing

Update to latest juju/testing.
Update blobstore rev

Fixes https://bugs.launchpad.net/juju-core/+bug/1367431
Merge pull request #722 from axw/master

Update blobstore rev

Fixes https://bugs.launchpad.net/juju-core/+bug/1367431
Merge pull request #717 from howbazaar/jujud-test-fixes

Mock out lumberjack config for tests.

Drive by also adds a few extra logging bits.
Changed a fmt.Printf to a c.Log to avoid extra test noise.