Preparing for release 1.3.2

Yeah quite strange, the first release will be 1.3.2 so as not to break artifact versioning.

Here is the roadmap:

- **gdx-ai 1.3.2**
 * it will be released in a few days
 * it will contain only what's currently in the gdx-ai extension that will be removed from the libgdx repo.
 * the wiki pages and the issues (just one IIRC) have to migrate on the new repo.
- **gdx-ai 1.3.3 or 1.4.0 (not sure)**
 * it will be released later (hopefully soon)
 * it will contain fixes and steering behaviors.
 * gdx-ai-tests will support multiple tests (currently you can only run one) and will have a launcher for each backend, i.e.  gdx-ai-tests-lgwl, gdx-ai-tests-android and so on. This will allow us to check gwt compatibility and have a raw idea of performance (FPS) for different platforms.