Upgrade core library to 3.6.1

[nrabinowitz]

Fixes edge cases in polyfill and improves polyfill perf in some cases (though not in my current benchmarks).

[coveralls]

Pull Request Test Coverage Report for Build 157

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 156:	0.0%
Covered Lines:	724
Relevant Lines:	724

---

💛 - Coveralls

[dfellis]

The performance improvements really appeared for the very large geofences. And according to Isaac seemed to mostly be Clang vs GCC (I compiled in Clang and got the improvements, GCC was equally fast with both) so it could be more compiler-dependent than I would have expected.

[nrabinowitz]

The performance improvements really appeared for the very large geofences. And according to Isaac seemed to mostly be Clang vs GCC (I compiled in Clang and got the improvements, GCC was equally fast with both) so it could be more compiler-dependent than I would have expected.

With my current benchmark on a relatively small polygon, there was no appreciable difference. But since we also get correctness, that's still a good thing :).