[TIMOB-11093] iOS: Update jscore to 538.11.1 version 

This PR updates the iOS Titanium SDK to a 64-bit version of JavaScriptCore maintained by https://github.com/phoboslab/JavaScriptCore-iOS, which is currently at version 538.11.1, and should resolve issues pertaining to [TIMOB-11093](https://jira.appcelerator.org/browse/TIMOB-11093), particularly the recent crashers [TIMOB-18137](https://jira.appcelerator.org/browse/TIMOB-18137), [TIMOB-18135](https://jira.appcelerator.org/browse/TIMOB-18135) and [TIMOB-18118](https://jira.appcelerator.org/browse/TIMOB-18118).

Since I am recently involved in this project, and time is short since the team wishes to resolve the issues listed above by Sunday evening, 2014.12.07, I ask anyone interested in this effort who is working over the weekend to please help me test this PR.

A few notes:
1. The goal of this PR is to address the three P1 crashers [TIMOB-18137](https://jira.appcelerator.org/browse/TIMOB-18137), [TIMOB-18135](https://jira.appcelerator.org/browse/TIMOB-18135) and [TIMOB-18118](https://jira.appcelerator.org/browse/TIMOB-18118).
2. This PR explicitly disables the profiler, which is classified as a P3.
3. The debugger will not work with this PR, as this is also classified as a P3.
4. Crittercism probably do not work, but this is classified as a P2.