Issues fixed

• gh-5184: restore linear edge behaviour of gradient to as it was in < 1.9. The second order behaviour is available via the edge_order keyword
• gh-4007: workaround Accelerate sgemv crash on OSX 10.9
• gh-5100: restore object dtype inference from iterable objects without len()
• gh-5163: avoid gcc-4.1.2 (red hat 5) miscompilation causing a crash
• gh-5138: fix nanmedian on arrays containing inf
• gh-5240: fix not returning out array from ufuncs with subok=False set
• gh-5203: copy inherited masks in MaskedArray.__array_finalize__
• gh-2317: genfromtxt did not handle filling_values=0 correctly
• gh-5067: restore api of npy_PyFile_DupClose in python2
• gh-5063: cannot convert invalid sequence index to tuple
• gh-5082: Segmentation fault with argmin() on unicode arrays
• gh-5095: don't propagate subtypes from np.where
• gh-5104: np.inner segfaults with SciPy's sparse matrices
• gh-5251: Issue with fromarrays not using correct format for unicode arrays
• gh-5136: Import dummy_threading if importing threading fails
• gh-5148: Make numpy import when run with Python flag '-OO'
• gh-5147: Einsum double contraction in particular order causes ValueError
• gh-479: Make f2py work with intent(in out)
• gh-5170: Make python2 .npy files readable in python3
• gh-5027: Use 'll' as the default length specifier for long long
• gh-4896: fix build error with MSVC 2013 caused by C99 complex support
• gh-4465: Make PyArray_PutTo respect writeable flag
• gh-5225: fix crash when using arange on datetime without dtype set
• gh-5231: fix build in c99 mode