test: temporarily move toStringTag tests to pending
test: temporarily move toStringTag tests to pending

note: waiting for v8 4.9, which includes native support for this.
also note that we will most likely start including pre-built
files with a target environment including generator functions
(such as babel-preset-es2015-node)

see: http://v8project.blogspot.hr/2016/01/v8-release-49.html

dvlsg/iterablejs