[WIP] Ease development install

- [X] Use fig for external services orchestration
- [X] Update README notes
- [ ] Use fig/docker for CaliOpen server
- [ ] Add fixtures data
- [ ] Add a oneliner install
- [ ] Add a test script

Try it now:

``` sh
mkdir install-test ; cd $_ ; \
    git clone https://github.com/CaliOpen/caliopen-dev.git --branch features/fig-install bin ; \
    ./bin/install ; \
    ./bin/start
```