New chapter notification

[akrolsmir]

WIP on 'austin' branch. Right now, it pulls the last updates in 24 hours, and then matches against the library, and sends a notification for all chapters.

Considerations/TODO:

• [x] Figure out background cycling details
• [x] Skip cache, always use newest data
• [x] Include updated chapter number in notification
• [x] Allow user to disable
• [x] Don't alert if user already read latest (i.e. Naruto updates from ch. 700 to 701, and user already read 701)
• [ ] Check for updates on wifi only

Probably not implementing:

• [ ] Allow user setting for update frequency?
• [ ] Play with notification copy text? e.g. "3 new chapters available", "
• [ ] What happens if multiple updates happen at once?
• [ ] Don't alert if user isn't caught up (i.e. Naruto updates from ch. 700 to 701, but user is on 650)

[ckmah]

81 implements vast majority of these

[ckmah]

since the bulk of new chapter notification functionality is already implemented as stated above, moving unimplemented features to new issue