BUG: Fix format statement associated with AttributeError.
BUG: Fix format statement associated with AttributeError.

Before this fix, a reference such as `numpy.wxyz` produced an
incorrect error message because of the invalid format specifiers
in the error message string:

    >>> import numpy
    >>> numpy.wxyz
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/.../numpy/__init__.py", line 206, in __getattr__
        "module %s has no attribute $s".format(__name__, attr))
    AttributeError: module %s has no attribute $s

After the fix:

    >>> import numpy
    >>> numpy.wxyz
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/.../numpy/__init__.py", line 206, in __getattr__
        "{!r}".format(__name__, attr))
    AttributeError: module 'numpy' has no attribute 'wxyz'

charris/numpy,MSeifert04/numpy,simongibbons/numpy,madphysicist/numpy,grlee77/numpy,pizzathief/numpy,mhvk/numpy,pdebuyl/numpy,endolith/numpy,madphysicist/numpy,endolith/numpy,simongibbons/numpy,jorisvandenbossche/numpy,seberg/numpy,seberg/numpy,pdebuyl/numpy,anntzer/numpy,pbrod/numpy,madphysicist/numpy,pbrod/numpy,abalkin/numpy,seberg/numpy,grlee77/numpy,mattip/numpy,mhvk/numpy,jakirkham/numpy,grlee77/numpy,pbrod/numpy,madphysicist/numpy,charris/numpy,mattip/numpy,mhvk/numpy,endolith/numpy,pizzathief/numpy,MSeifert04/numpy,jakirkham/numpy,MSeifert04/numpy,WarrenWeckesser/numpy,abalkin/numpy,mhvk/numpy,jakirkham/numpy,mattip/numpy,pdebuyl/numpy,charris/numpy,pdebuyl/numpy,numpy/numpy,anntzer/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,charris/numpy,jorisvandenbossche/numpy,pbrod/numpy,grlee77/numpy,jorisvandenbossche/numpy,numpy/numpy,mhvk/numpy,rgommers/numpy,rgommers/numpy,simongibbons/numpy,jakirkham/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,jakirkham/numpy,numpy/numpy,grlee77/numpy,abalkin/numpy,pizzathief/numpy,rgommers/numpy,MSeifert04/numpy,madphysicist/numpy,WarrenWeckesser/numpy,WarrenWeckesser/numpy,mattip/numpy,endolith/numpy,numpy/numpy,anntzer/numpy,pizzathief/numpy,pbrod/numpy,rgommers/numpy,simongibbons/numpy,simongibbons/numpy,anntzer/numpy,jorisvandenbossche/numpy,seberg/numpy,pizzathief/numpy