Added support for rulesets
Fix compatability with PHP 5.3
Another fix for PHP 5.3 compat
Added additional test
Added possibility to add and get rulesets
Updated README on rulesets
Merge branch 'rulesets'

* rulesets:
  Updated README on rulesets
  Added possibility to add and get rulesets
  Another fix for PHP 5.3 compat
  Fix compatability with PHP 5.3
  Added support for rulesets
Merge branch 'master' of github.com:cocur/slugify

* 'master' of github.com:cocur/slugify:
  readme typo