Bump version to 0.2.0 in docker container

Summary: Bump version to 0.2.0 in docker container

Reviewed By: kiukchung

Differential Revision: D21316175

fbshipit-source-id: ac0471164e2d5817d5529d629d50a30cb25966d7

Rename main launch method and expose Metric data

Summary:
1. Rename launch method from main to launch_workflow so users can write custom wrappers to configure for example metrics handler
2. Expose MetricData class so users can write custom metrics handler
3. Rename with_etcd parameter to with_embed_backend to indicate that there is an embedded backend for torchelastic, but eventually it can change from etcd to something else.

Reviewed By: kiukchung

Differential Revision: D20971719

fbshipit-source-id: 8d0ad0384a22a0d6c128973001ad521613e58651

0.2.0rc1

Summary: Bump version to 0.2.0rc1 that introduces minor bug fixes

Reviewed By: drdarshan

Differential Revision: D20958385

fbshipit-source-id: 44563a72bd2a567dd586613ea4a378d30af163ba

0.2.0rc0

Summary: [release] 0.2.0rc0

Reviewed By: kiukchung

Differential Revision: D20928147

fbshipit-source-id: 76353ba286a31cb8e7a250fc80ae6d7189362fba

Bump version to 0.2.0.dev0

Summary: Bump version to 0.2.0.dev0

Reviewed By: kiukchung

Differential Revision: D20899213

fbshipit-source-id: 6ccbc3a02381996e6bcca0050629dab5586519ac

Summary: release 0.1.0rc1

Reviewed By: isunjin

Differential Revision: D18839138

fbshipit-source-id: d04596e48450a2e0be6f06ae60937deacb513b8f

Install classy-vision by default in torchelastic/… (pytorch#14)

Summary:
Valiated docker build

```
VERSION=0.1.0.dev1
docker build -t torchelastic/examples:$VERSION . --build-arg BASE_IMAGE=pytorch/elastic:$VERSION
```
Pull Request resolved: pytorch#14

Differential Revision: D18824375

Pulled By: kiukchung

fbshipit-source-id: eb731e72012cea8ad8c0ed54b835097de5c4ab55