fix a WeakMap test
add Set.prototype.keys
add {Map, WeakMap}.prototype.set & {Set, WeakSet}.prototype.add tests
add no AssignmentExpression yield
update numbering
add Computed Property Name
add Shorthand Property

"Shorthand Property" is "PropertyDefinition : IdentifierReference".
https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object-initializer
https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object-initializer-runtime-semantics-propertydefinitionevaluation
fix a Template Literal test
add Tagged Templates
fix Array Comprehension and Generator Comprehension tests

Comprehension must use for-of.
https://people.mozilla.org/~jorendorff/es6-draft.html#sec-array-comprehension
add Destructuring Binding Patterns
update spread array(...) operator
update spread call(...) operator
update revision
Merge pull request #6 from syoichi/pr4-update

Add Computed Property Name, Shorthand Property, Tagged Templates, Destructuring Binding Patterns, Set#keys() & Update and Fix tests