Inserts and deletes sync with FRC

[rnystrom]

There was an issue where the row data would easily get out of sync with the real rows when inserting and deleting. Using NSFetchedResultsController made this super obvious.

Huge thanks to @LindyLo for the sample project with a reproduced issue!

fixes #16

[bassrock]

👍 !!!!

[bassrock]

I am not sure this is completely fixed.

I am using this with a sorted NSFetchedResults Controller and still get the bug from #16. When I print the index rows from the Insert case it prints as follows:

25
5
12
22
28
4
31
2
29
7
8
26
23
32
19
0
21
11
35
1
17
6
3
20
36
15
9
14
30
16
13
34
27
10
18
24
33

As you see it prints out of order, which is why we get an out of bounds error still. My guess is the tableView.beginUpdates and tableView.endUpdates most likely handle this situation and do not cause issues in UIKit, but these do not exist in WatchKit.

[rnystrom]

I think once I get the unit test abstractions working better we'll be able to zero in on what's going on here. Ya it's difficult to get both the NSFRC API and this working in tandem since WKInterfaceTable seems to immediately take action as opposed to UITableView's commit/transaction API.

[bassrock]

yea, well actually my update fixes this. Forgot to mention that ;)

[rnystrom]

👍