Fix the travis configuration file
Fix the travis configuration
Add a Makefile for convenience
Add Travis status badge to the README

[ci skip]
Use the develop branch for the travis badge
Improve README layout ^^ pursue the perfection
Merge pull request #4 from Ledej/improve-api

- Travis is used to run the tests suite against Python 2.7 and 3.3
- Use a Makefile to centralize useful dev commands
- Improves the README to display the travis status badge