Local storage bounding for iOS

[louisg1337]

This change is a continuation of issue 1020 in which we were putting a bound on the number of entries that can be stored under a specific key in the local storage. The iOS change is now finished, I essentially copied the same code I used from the Android change and just implemented it here. For testing I did the same thing that I did in the Android version. I added BOUND+1 entries of dummy data to "CURR_GEOFENCE_LOCATION", and then I ran the code, making sure that we were left with only BOUND-1 number of previous entries, and then the current entry. I attached a log file below that demonstrates the BOUND+1 test that I did, given that BOUND = 3. At the very start you can see that I added 4 filler NSDictionary values to the local storage, and then at the end of the file we end up with only 2 of those filler NSDictionary objects, and the 1 actual CURR_GEOFENCE_LOCATION value.

bounding_local_storage_ios.pdf

[shankari]

LGTM barring extra addition to header file.
I am happy to merge once that is fixed.

[shankari]

@louisg1337 Can you also bump up the version number since we already published a version with only the android changes? I will then merge and you can bump up the number in the phone repo.

[louisg1337]

Just bumped up version number!

[shankari]

@louisg1337 Created new release https://github.com/e-mission/cordova-usercache/releases/tag/v1.1.8
you can now bump up the version in the phone repo

[louisg1337]

@shankari Here is the bumped up phone repo PR.