Merge pull request #1020 from jonboulle/master

docs: add note about version, remove old Vagrantfile

README.md

@@ -1,6 +1,14 @@
 # etcd
 
-README version 0.4.6
+### WARNING ###
+
+The current `master` branch of etcd is under heavy development in anticipation of the forthcoming 0.5.0 release. 
+
+It is strongly recommended that users work with the latest 0.4.x release (0.4.6), which can be found on the [releases](https://github.com/coreos/etcd/releases) page.
+
+Unless otherwise noted, the etcd documentation refers to configuring and running 0.4.x releases.
+
+## README version 0.4.6
 
 A highly-available key value store for shared configuration and service discovery.
 etcd is inspired by [Apache ZooKeeper][zookeeper] and [doozer][doozer], with a focus on being:
@@ -30,28 +38,7 @@ The latest release and setup instructions are available at [GitHub][github-relea
 
 [github-release]: https://github.com/coreos/etcd/releases/
 
-
-### Building
-
-You can build etcd using the standard go workflow - ensure `GOPATH` is set appropriately, and then:
-
-```sh
-go get github.com/coreos/etcd
-```
-
-which will generate a binary at `$GOPATH/bin/etcd`
-
-_NOTE_: etcd requires go 1.2+. Please check your installation with
-
-```
-go version
-```
-
-See the [development tools documentation][development-tools] for alternative build methods like using Vagrant.
-
-[development-tools]: https://github.com/coreos/etcd/blob/master/Documentation/development-tools.md
-
-### Running
+### Running etcd
 
 First start a single-machine cluster of etcd:
 
@@ -124,9 +111,11 @@ The `v1` API has been deprecated and will not be supported.
 
 During the pre-v1.0.0 series of releases we may break the API as we fix bugs and get feedback.
 
-#### 32bit systems
+#### 32-bit systems
+
+etcd has known issues on 32-bit systems due to a bug in the Go runtime. See #[358][358] for more information.
 
-etcd has known issues on 32bit systems. We plan to address these issues after the 0.4 release.
+[358]: https://github.com/coreos/etcd/issues/358
 
 ### License