Flextype 0.3.0 release

New

• date_format setting added to /site/config.site.yml
• Pages: Fixed bug with pages sort and slice in getPages() method
• Pages: Fixed bug with pages list for /pages folder
• Pages: Fixes for generating page url field
• Pages: Added ability to create date field automatically for pages if date field is not exists.
• Code cleanup and refactoring #5