Zurb Foudnation framework updated to 5.3.0
Added phpdocumentor
First approach for issue #11
Added API documentation in Markdown format
Fix problem exposed by #16
Updated API doc
API docs
Improved docs
Update README.md

Typo
Improved config option description
Function rename
Scripts rework
Updated collections versions
Minor changes
Changing pipeline timestamp now foces pipeline rebuild. Fixes #26