Fixing error in initialization example in README.md
Adding composer.json file to list the engine on packagist
Adding php v5.5 to test again in .travis.yml
Adding packagist badges to README, adding git flow to contributing section
Bumping version to 1.0.1
Merge branch 'release/1.0.1'

* release/1.0.1:
  Bumping version to 1.0.1
  Adding packagist badges to README, adding git flow to contributing section
  Adding php v5.5 to test again in .travis.yml
  Adding composer.json file to list the engine on packagist
  Fixing error in initialization example in README.md