Revert "Revert "update""

Reverts ccd-utexas/imageutils#2

Problem is with new numpy version:
```
grad09sh:imageutils harrold$ CC=clang python setup.py install
Freezing version number to imageutils/version.py
running install
running bdist_egg
running egg_info
writing requirements to imageutils.egg-info/requires.txt
writing imageutils.egg-info/PKG-INFO
writing top-level names to imageutils.egg-info/top_level.txt
writing dependency_links to imageutils.egg-info/dependency_links.txt
reading manifest file 'imageutils.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files found matching '*.pyc'
warning: no previously-included files found matching '*.o'
no previously-included directories found matching 'docs/_build'
no previously-included directories found matching 'build'
writing manifest file 'imageutils.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.6-intel/egg
running install_lib
running build_py
copying imageutils/__init__.py -> build/lib.macosx-10.6-intel-2.7/imageutils
copying imageutils/array_utils.py -> build/lib.macosx-10.6-intel-2.7/imageutils
copying imageutils/scale_img.py -> build/lib.macosx-10.6-intel-2.7/imageutils
copying imageutils/version.py -> build/lib.macosx-10.6-intel-2.7/imageutils
copying imageutils/tests/test_scale_img.py -> build/lib.macosx-10.6-intel-2.7/imageutils/tests
running build_ext
building 'imageutils.sampling' extension
clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c imageutils/sampling.c -o build/temp.macosx-10.6-intel-2.7/imageutils/sampling.o
In file included from imageutils/sampling.c:346:
In file included from /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/arrayobject.h:15:
In file included from /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:17:
In file included from /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1728:
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/npy_deprecated_api.h:11:2: warning: "Using deprecated NumPy
      API, disable it by #defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-W#warnings]
#warning "Using deprecated NumPy API, disable it by #defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION"
 ^
1 warning generated.
In file included from imageutils/sampling.c:346:
In file included from /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/arrayobject.h:15:
In file included from /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:17:
In file included from /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1728:
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/include/numpy/npy_deprecated_api.h:11:2: warning: "Using deprecated NumPy
      API, disable it by #defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-W#warnings]
#warning "Using deprecated NumPy API, disable it by #defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION"
 ^
1 warning generated.
gcc-4.2 -bundle -undefined dynamic_lookup -arch i386 -arch x86_64 -g build/temp.macosx-10.6-intel-2.7/imageutils/sampling.o -o build/lib.macosx-10.6-intel-2.7/imageutils/sampling.so
unable to execute gcc-4.2: No such file or directory
error: command 'gcc-4.2' failed with exit status 1
```