FIX: pagination when changing the number of items per page

The number of items to display handling was completely breaking the displaying of said items. Matvey helped finding the solution!
FIX: Pagination now behaves as expected

Now, selecting the new number of items goes back to page 1, and the nextpage behaves correctly. Somehow, the values that used to be stored in the Store for start and limit where not correct (certainly not the right type).
Merge pull request #152 from sposs/patch-4

FIX: pagination when changing the number of items per page