Merge pull request #221 from bocoup/typeof

test/language/expressions/typeof/S11.4.3_A1.js

test/language/expressions/typeof/S11.4.3_A3.5.js

test/language/expressions/typeof/S11.4.3_A3.6.js

test/language/expressions/typeof/S11.4.3_A3.7.js

test/language/expressions/typeof/boolean.js

test/language/expressions/typeof/built-in-functions.js

test/language/expressions/typeof/get-value.js

test/language/expressions/typeof/native-call.js

test/language/expressions/typeof/native-no-call.js

test/language/expressions/typeof/null.js

test/language/expressions/typeof/number.js

test/language/expressions/typeof/string.js

test/language/expressions/typeof/syntax.js

test/language/expressions/typeof/undefined.js

test/language/expressions/typeof/unresolvable-reference.js