Update CRUD.entities.js

convert episode rating to Integer (as is ratingcount already) 
convert series rating, ratingcount and runtime to Integer
This allows for proper presentation in the episode.html and seriedetails.html
BTW, when 0.55 gets pushed out, will the episode migrations for 7 and 8 be run one after the other, or will this present problems?
Merge pull request #104 from garfield69/patch-1

Update CRUD.entities.js