Wrote initial outlining of the API Implementation Guide.
Added organizational aspects.
Merge branch 'master' of https://github.com/juju/juju into api-implementation-guide
Merge branch 'master' of https://github.com/juju/juju into api-implementation-guide
Added versioning and first pattern.
Merge branch 'master' of https://github.com/juju/juju into api-implementation-guide
combined queue-channel implementations, factored out queue behaviour to eliminate considerations of goroutines
WIP; RUW no longer embedded in liveSource, otherwise functional
Update provisioning internals docs

 - Placement directives
 - Availability zone spread

Also, changed to use Markdown format.
rearrange further, add some tests
pull many many commits from master
Merge pull request #679 from voidspace/waitfor-replicaset

Remove the Remove

replicaset/replicaset_test : get rid of extraneous calls to Remove

Remove is a slow operation, and we're seeing spurious failures in CI here. We create a bunch of mongo instances and defer removing them from the replicaset. We destroy them immediately after removal, and then destroy the root, so the Remove is extraneous. This should improve test reliability.
Add a backups abstraction.
Add Create() to the backups abstraction.
cmd/jujud: avoid duplicate code for counting upgrade attempts in upgrade tests
cmd/jujud: avoid duplication in the 2 "success" upgrade test cases
cmd/jujud: shorten upgrade test helper names

Makes the tests a little more readable.
cmd/jujud: rationalise machine & config handling in upgrade tests

These tests have always been a bit confusing because machine-0 and its
config were being stored on the test suite, with various helper
methods magically using them as required. Data associated with other
machines have always been stored in local variables and passed around.

This change makes the data for machine-0 be handled consistently. This
makes for more explicit, clearer tests and has allowed for various
cleanups.
Merge branch 'master' into lp-1336843-wo-jenv-destroy-env
Use values instead of pointers.