Changes :
- Manga List View Controller changed to separate view controllers of filters and sites

TODO:
- Sites part unfinished (add / reload / delete)
Changes:
- Change the images view controller with a UIPageViewController
- TODO: order images
- TODO: perform better image loading
Changes:
- Image loading with previous image chowing
- TODO: Improve images loading with queue
Changes:
- Images loading in background
- Images view controller with no status bar and navigation bar
- Images sorted
Changes:
- Set Chapter as read and non new at the end of the chapter images
- Set the image to aspect fit
Changes:
- Add to Data Model class a create method
Changes:
- Add possibility to choose the managed object context from app delegate or new
- MangaListViewController and MangaViewController are updated at each loading
Changes:
- Add Site controller with site generation
- Sites list updated on creation and suppression
- Manga Xml Parser get a manga object check to verify data
Commit after merge