Added file README.md
Merge branch 'master' of https://github.com/fritaly/commons

# By francois_ritaly (3) and Francois RITALY (1)
* 'master' of https://github.com/fritaly/commons:
  Added method com.github.fritaly.commons.Fraction.valueOf(String)
  Added file README.md
  Added file for integration with Travis CI
  Initial import