Releasing the 0.2 version of the specs

Hello all,

As I mentioned on GitHub and in today's meeting, I would like to publish 
soon a new version of the specs, with version number 0.2 (tentatively).

Before releasing this, I would like to merge the following pull 
requests, which introduce backwards-compatible features:

     - https://github.com/reconciliation-api/specs/pull/41
     - https://github.com/reconciliation-api/specs/pull/80
     - https://github.com/reconciliation-api/specs/pull/87
     - https://github.com/reconciliation-api/specs/pull/89

By backwards-compatible, I mean that any service conforming to the 
existing specs will not be rendered incompatible after those changes.

Once this 0.2 release is done, I have the intention of merging 
backwards-incompatible changes, such as the change of format for URL 
templates and the REST-ification of the API (for which pull requests are 
yet to be opened).

If you feel like other changes should be made before 0.2, let us know!

Best,
Antonin