Introduce Parse{Unit,Service,Machine}
Merge branch 'master' of https://github.com/juju/juju into 106-parsetag-refactor

Conflicts:
	state/api/deployer/unit.go
	state/api/firewaller/service.go
	state/api/provisioner/machine.go
wip
Update for juju/names part 3
Final tweak
Bug #1328716: Clean up CONTRIBUTING a bit.
update to latest juju/names
Merge branch 'master' of https://github.com/juju/juju into 106-parsetag-refactor
fixups after merge from trunk
Merge pull request #103 from davecheney/106-parsetag-refactor

Update for juju/names refactor part 3

* Replace all the calls to ParseTag(tag, hint) to a specific ParseXXXTag method. 
* Where ParseTag is not called with a hint, adjust as necessary, there is one call for this in the codebase.
* Add some grossness where code like

type Unit struct { tag string }
func (u *Unit) Name() { _, id, err := names.ParseTag(tag, names.UnitTagKind); if err != nil { panic(err) } }

Into something a little more explicit using type specific ParseXXXTag methods.

In the next branch rather than storing the string form of the tag inside the Unit structure (without validation I may add), then parsing it (and possibly panicing) to get its Id, store a real Tag value in the struct then calls to name can just return the Id of the tag (or a more specific value available on the Tag's implementation type).
Merge pull request #65 from ericsnowcurrently/contributing-doc

Bug #1328716: Clean up CONTRIBUTING a bit.

Per Bug #1328716, here's a patch that updates CONTRIBUTING to mesh better with README.  It also fills in some gaps, particularly with tools, and makes the workflow more clear.  Given that working on this patch is my first exposure to the workflow I have no illusions as to perfect accuracy.  So feedback would be much appreciated.