DOC: minor changes in optimize tutorial
BLD: py3k: fix 2to3 import mangling of sparse.csgraph compiled extensions.

Also install csgraph tests.
TST: fix one Python 2.4 issue and skip some tests with numpy < 1.6 in csgraph.

See ticket 1669 for details.

Also skip some other tests where needed (Python 2.4, NumPy 1.5.x).
Merge pull request #242 from endolith/patch-3

Change example curve in interpolate tutorial.
Merge pull request #241 from dlaxalde/doc/root-tutorial

use root in optimize tutorial
BUG: Return gracefully if ctypes not available.
Merge pull request #247 from teoliphant/quadpack_fix

BUG: Return gracefully if ctypes not available.
BUG: Missing line from PR #247
Merge pull request #243 from rgommers/fix-csgraph-py3k

Fix csgraph py3k build
Merge pull request #244 from rgommers/fix-py24-issues

TST: fix one Python 2.4 issue and skip some tests with numpy < 1.6 in cs...
Merge branch 'pull-232-netcdf' into master.

Closes https://github.com/scipy/scipy/pull/232.
ENH: wrap FITPACK sphere.f and add SphereBivariateSpline classes to interpolate.
DOC: add new interpolate classes (SphereBivariateSpline) to release notes.
TST: interpolate: fix TestLSQSphereBivariateSpline to not raise warnings any more.
Merge PR-192, which wraps FITPACKs sphere.f

This PR was rebased/squashed because it had a lot of merge conflicts.

https://github.com/scipy/scipy/pull/192
BUG: fix issue with ndimage.zoom. Closes ticket 1122.

Reviewed at https://github.com/scipy/scipy/pull/204.
BUG: interpolate: preserve input shape in splev
DOC: document splev behavior change
BUG: interpolate: pass on ext parameter in splev
Merge branch 'pull-197-splev' into master.

Discussion at https://github.com/scipy/scipy/pull/197.

Thanks also to Joonas Paalasmaa.