NF: informative error when trying to slice images

From suggestion by Eric L.
BF: add np.intp, np.uintp to supported dtypes

Add np.intp, np.uintp to supported header dtypes if they compare equal
to supported types with np.dtype(t1) == np.dtype(t2).
RF: specify endiannes of PARREC data

Is PARREC data always little-endian?  Guess that it is for now.
RF: specify endianness on nifti write

PARREC to nifti should specify data endianness.
BF: work round Python bz2 bug

Python 3.3 sometimes has a bug writing empty strings to bz2 - see:

* http://bugs.python.org/issue16828
* https://github.com/ilanschnell/bsdiff4/issues/3
RF: delete objects holding files for windows

Windows complaining about trying to delete files that still have objects
holding onto them.  Delete these objects as we go.
RF: allow for Windows double == longdouble

On Visual studio builds of numpy, longdouble is the same as double.
Merge pull request #271 from matthew-brett/error-on-slice

MRG: informative error when trying to slice images

From suggestion by Eric L.
BF: cannot quote command for Windows

Windows errors for a command with quotes, bless.

Only quote arguments with spaces, hoping the commands don't have spaces.
RF: don't test opening gzip in text mode

It doesn't make sense to open gzip files in text mode, and Windows is throwing
an error, so drop that test.
Merge pull request #273 from matthew-brett/windows-fixes

MRG: fixes to get Windows tests to pass

A few problems with the Windows buildbots:

* Gzip won't open in text mode (it shouldn't anyway);
* A bug in scriptrunners causing the command name to be quoted, which Windows
  does not allow;
* Longdouble is the same thing as float64, need to allow for this in tests
  settting header dtype;
* Windows is fussy about objects letting go of memory maps before deleting the
  file, so delete objects before letting system delete temporary files.
Merge pull request #272 from matthew-brett/parrec-endianness

MRG: specify endianness of PARREC data

Guess that REC data is always little-endian.
RF: refactor test to work on numpy 1.5

Structured array comparisons with ``assert_array_compare`` fail for
numpy 1.5; use a more manual comparison method.
TST: travis builds with min / max dependencies

From an idea by Eric L.
MAINT: update .mailmap
MAINT: ignore buildbot patch

Patch written by `try_branch.py` when sending local changes for testing
by the buildbot.
MAINT: update package info

Update numpy dependency to 1.5, just because that seems to be the oldest
that anyone is supporting these days.

Update ourselves from alpha to beta status - yay!

Update links to downloads; these have changed since the last release.
DOC: update installation instructions

Prefer pip, forget easy_install
DOC: update author list on the front web page

Add authors joined since the last release.
DOC: formatting, years in COPYING file

Missing extra colon messing up formatting.
Update Michael's years of contribution.

FIx