Merge pull request #440 from anba/es2015_errata

test/built-ins/Boolean/prototype/S15.6.3.1_A1.js

test/built-ins/Boolean/prototype/S15.6.4_A1.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A1_T1.js

test/built-ins/Boolean/prototype/toString/S15.6.4.2_A1_T2.js

test/built-ins/Boolean/prototype/valueOf/S15.6.4.3_A1_T1.js

test/built-ins/Boolean/prototype/valueOf/S15.6.4.3_A1_T2.js

test/built-ins/Date/15.9.1.15-1.js

test/built-ins/Number/15.7.4-1.js

test/built-ins/Number/prototype/S15.7.3.1_A2_T1.js

test/built-ins/Number/prototype/S15.7.3.1_A2_T2.js

test/built-ins/Number/prototype/S15.7.3.1_A3.js

test/built-ins/Number/prototype/S15.7.4_A1.js

.../built-ins/Number/prototype/toFixed/S15.7.4.5_A1.1_T01.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A1_T01.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A1_T02.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A1_T03.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A2_T01.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A2_T02.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A2_T03.js

test/built-ins/Number/prototype/toString/S15.7.4.2_A2_T04.js