adding contributing file
Added CmfBlockHelper
Refactored Twig extension
Merge pull request #76 from WouterJ/templating_helper

Added Templating Helper for PHP templates
Added tests for template helper
Fixed doc block comment
Merge pull request #79 from WouterJ/master

Added test for templating helper
Update CmfBlockExtension initRuntime() typehint
Merge pull request #80 from wcluijt/patch-1

Update CmfBlockExtension initRuntime() typehint
Add admin extension to edit base fields of base block document
Merge pull request #81 from sveriger/editable_basedata

Add admin extension to edit base fields of base block document