Merge pull request #245 from graimundo/master

- Changed schema so that category element in a market_entry element and the development stage element in a version element are mandatory/required
 'New version of plugin metadata'
Reverted mandatory category and development stage.
Added entries for Phase and Pedis (required dependency for Phase).
Merge pull request #249 from rpbouman/master

Added entries for Phase and Pedis (required dependency for Phase).
 'New version of plugin metadata'
- Added some of the missing category and development stage information