changed test/bootstrap to use composer/autoload

added composer in .travis.yml
added /vendor to gitignore
added phpunit in composer.json
Changed the syntax from 5.2 to 5.3 using namespace

Compliant with PSR-2.
All tests were rewritten as well.
Also, removed all executable flags where not needed.
added namespace changes in changes.txt
Merge pull request #300 from lavoiesl/namespaces

Changed the syntax from 5.2 to 5.3 using namespace