Release 0.9.0

[johanjanssens]

Related PR's for documentation purposes

1. Opengraph support #86

Implements automatic support for opengraph and additionally twitter cards. For twitter we making use of the opengraph properties supported by twitter. For info see: https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/markup

2. Data JSON support #82

Add several improvements to the data objects. It's now possible to cast a data object to a string and it's now possible to create a new data object from an associative array of data.

3. Fix markdown partials are not rendered correctly #88

4. Fix Joomla router is exposing 'view' in canonical #84