Fix issue with PyPy2 (#1725)
Fix issue with PyPy2 (#1725)

Under PyPy2 you can't do u"foo" == lazy(static, str)("bar") because the
code assumes dir(str) is a strict subset of dir(unicode), which isn't
true on PyPy2. The other way around is no problem however, and the
other strings in the static assets lists are unicode anyway.
readevalprint/mezzanine,stephenmcd/mezzanine,frankier/mezzanine,christianwgd/mezzanine,ryneeverett/mezzanine,ryneeverett/mezzanine,wbtuomela/mezzanine,molokov/mezzanine,christianwgd/mezzanine,wbtuomela/mezzanine,readevalprint/mezzanine,readevalprint/mezzanine,ryneeverett/mezzanine,dsanders11/mezzanine,frankier/mezzanine,christianwgd/mezzanine,dsanders11/mezzanine,jerivas/mezzanine,dsanders11/mezzanine,molokov/mezzanine,stephenmcd/mezzanine,wbtuomela/mezzanine,jerivas/mezzanine,molokov/mezzanine,jerivas/mezzanine,stephenmcd/mezzanine,frankier/mezzanine