How does a new feature end up in Joomla?

How does a new feature end up in Joomla? Or, how does Joomla's development cycle works, based on a story of the new Category Item Counter.

Peter will discuss that with a new feature (Category Item Counter) that ended up in Joomla 3.5:

• The purpose of the feature
• where and how the idea for the feature was created
• how the Joomla community has helped to develop this function
• how Joomla development cycle works, including testing procedures, and who is Travis?
• problems with different core components
• the hidden secret of com_categories
• how to add a Category Item Counter to your own components.