Merge 'rwaldron/exponentiation-operator'

test/built-ins/Math/pow/S15.8.2.13_A1.js

test/built-ins/Math/pow/S15.8.2.13_A10.js

test/built-ins/Math/pow/S15.8.2.13_A11.js

test/built-ins/Math/pow/S15.8.2.13_A12.js

test/built-ins/Math/pow/S15.8.2.13_A13.js

test/built-ins/Math/pow/S15.8.2.13_A14.js

test/built-ins/Math/pow/S15.8.2.13_A15.js

test/built-ins/Math/pow/S15.8.2.13_A16.js

test/built-ins/Math/pow/S15.8.2.13_A17.js

test/built-ins/Math/pow/S15.8.2.13_A18.js

test/built-ins/Math/pow/S15.8.2.13_A19.js

test/built-ins/Math/pow/S15.8.2.13_A2.js

test/built-ins/Math/pow/S15.8.2.13_A20.js

test/built-ins/Math/pow/S15.8.2.13_A21.js

test/built-ins/Math/pow/S15.8.2.13_A22.js

test/built-ins/Math/pow/S15.8.2.13_A23.js

test/built-ins/Math/pow/S15.8.2.13_A24.js

test/built-ins/Math/pow/S15.8.2.13_A3.js

test/built-ins/Math/pow/S15.8.2.13_A4.js

test/built-ins/Math/pow/S15.8.2.13_A5.js