Changed visibility of Slugify properties from private to protected
Merge pull request #44 from acelaya/feature/protected-properties

Ease extension of Slugify class
The regular expression used to sanitize the slug can now be set as a constructor argument or by calling setRegExp
Added test for the regExp feature
Fixed regexp constant name
Added test to cover the Slugify construct
Fixed typo
Renamed default regular expression constant to LOWERCASE_NUMBERS_DASHES
Merge pull request #45 from acelaya/feature/regexp

Feature/regexp
Fix type hinting
Remove unused use statement
Immprove PHPDoc, fix typos
Remove duplicate entry from rules list
Update README for v0.10.2 release
Add section about regular expression to README