templates instead of pages!

- no more subparts!
- template model which will hold the hash
- page form build from hash
removed unused database fields

and fixed tests!
working with defaults
update pjax to v1.8.0
back and forth bug

closes #60
settings now also use templates syntax
ability to delete pages and some code improvements
Merge pull request #68 from smashingboxes/templates

Create new pages from admin panel