Remove antipodal test cases

The Vincenty formula can fail to converge for antipodal points (see http://en.wikipedia.org/wiki/Vincenty's_formulae#Nearly_antipodal_points), so those test cases are removed.  These tests fail with the latest V8 due to optimization of trig functions with lookup tables.  For example, Math.cos(Math.PI / 2) is no longer calculated based on the value of Math.PI / 2 (which is different than the actual value of π / 2).  Instead, values close to multiples of π / 2 are determined to be 0 (which is arguably what you want).  Previously the tests were relying on very small numbers being returned in this case.

test/spec/ol/ellipsoid/ellipsoid.test.js

@@ -256,27 +256,6 @@ describe('ol.Ellipsoid', function() {
       vincentyInitialBearing: 0,
       vincentyDistance: 0
     },
-    {
-      c1: [180, 90],
-      c2: [180, -90],
-      vincentyFinalBearing: 180,
-      vincentyInitialBearing: 180,
-      vincentyDistance: 20003931.458623584
-    },
-    {
-      c1: [180, 90],
-      c2: [-180, 90],
-      vincentyFinalBearing: 90,
-      vincentyInitialBearing: 90,
-      vincentyDistance: 9.565041537306137e-26
-    },
-    {
-      c1: [180, 90],
-      c2: [-180, 90],
-      vincentyFinalBearing: 90,
-      vincentyInitialBearing: 90,
-      vincentyDistance: 9.565041537306137e-26
-    },
     {
       c1: [180, -90],
       c2: [180, -90],
@@ -284,20 +263,6 @@ describe('ol.Ellipsoid', function() {
       vincentyInitialBearing: 0,
       vincentyDistance: 0
     },
-    {
-      c1: [180, -90],
-      c2: [-180, 90],
-      vincentyFinalBearing: 7.0164775638926606e-15,
-      vincentyInitialBearing: 7.0164775638926606e-15,
-      vincentyDistance: 20003931.458623584
-    },
-    {
-      c1: [180, -90],
-      c2: [-180, 90],
-      vincentyFinalBearing: 7.0164775638926606e-15,
-      vincentyInitialBearing: 7.0164775638926606e-15,
-      vincentyDistance: 20003931.458623584
-    },
     {
       c1: [-180, 90],
       c2: [-180, 90],