Akeneo PIM 1.7 compatibility

Prepare 1.4 release (#86)

* Update README.md
* Update composer.json
* Update .travis.yml

Release 1.3

v1.3.0

Fix last issues before release

Mimic

v1.2.0

Create tag for v1.2.0

Initial release

Merge pull request #6 from akeneo-labs/readme

Add a README.md