Added Travis build status to Readme

Removed old/unavailable versions of php from travis

Fix for phpunit package name in composer.json

Make it clearer that last parameter to phpunit is the test directory

Added Travis CI file

Fix for more recent versions of PHP which evaluate empty strings differently

Merge branch 'master' of github.com:njh/twig-html-helpers

Added 'clean' target to Makefile

Fetch composer.phar over HTTPS, not HTTP

Removed composer deprecated '--dev' flags

Removed deprecated '--strict' flag

Merge pull request #3 from iwata/master

fix empty value as options

Added function parameter documentation to the readme

Codestyle