Bug fix: nbins can be >256 in threshold_isodata

The threshold_isodata function created an arange of values up to the
number of bins, but gave it type np.uint8, limiting the number of bins
to 256.

Fixes #1085.
Fix incorrect test function signature
Merge pull request #1086 from jni/thresh-iso

Bug fix: nbins can be >256 in threshold_isodata
Update Travis build to use Anaconda.
Update Travis build to use Anaconda

Travis updates and fixes

More travis fixes

Another travis attempt

Revert changes

Use PIL and Pillow

Refactor travis into 4 different builds

Fix activation error

Remove explicit mpl in build_versions.py

Make matplotlib an explicit requirement

Rearrange travis

Make pillow a hard requirement

Try again to make Pillow optional

Fix bash syntax error

Fix bash syntax error

Bump required cython version

More rearrangments

Remove mpl from build_versions, rearrange travis

Fix version check

Make matplotlib explicit again

Conda install into test env

Check for proper install

Allow tests to skip if networkx is not available

Allow tests to skip if networkx is not available

Try swapping pillow for matplotlib

Allow tests to pass when matplotlib is not present

Remove matplotlib from build_versions

Print PIL version

Get pillow from PIP

Allow tests to skip if matplotlib is not present.

Allow tests to skip if networkx is not present.

travis fix

Remove unused mpl import that caused test error

Use nose-cov and do not run doctests without optional libs

Bump required numpy version and fix nose calls

Make overlay test repeatable

bump numpy version again

Move low-end numpy to python 2.7

Play with minimum versions

Add version requirements and use functions

Add version requirements and use functions

Allow require to skip a test

More implementation of require decorator

Update require decorator and clean up tests

Only use requires decorator when needed

Fix python3 error in version_requirements

Fix build errors

Fix handling of require with tests

More fixes for require handler

Use latest miniconda

Fix more build errors

Fix another dict comprehension and travis file.

Fix missing imports

Fix dictionary again

Fix import warning

Fix last failing test on 2.6

Skip doc examples on python2.6

Do not run doctests on python2.6

Fix typo in travis.yml

Make numpy-1.6 compatibility changes

Use numpy-1.6 in travis python2.6

Add tests for version requirements

Fix line noise in PR

Add additional io plugins

Fix simpleitk test.

Fix python 3 error in freeimage_plugin.

Install imread in Travis.

Put matplotlib settings in XDG recommended directory

Fix formatting in travis yml

Fix formatting in travis yml

Make sure to close PIL file atexit

Fix name of apt package xcftools

Fix pil fp closing

Fix matplotlibrc creation

Only download SimpleITK on py2x, run coverage on py27

Fix travis yml syntax error

Run coveralls on py2.7

Install SimpleITK on py3.3 and run coverage on py3.3

Make simpleitk install quiet

Use standard nose and clean up incantation

Fix travis yml syntax error

Put in miniconda workout for libc error.

Fix imread plugin.

Fix travis syntax

Remove unused import

Remove miniconda libpng in favor of system png

Fix imread install and move libm removal to after optional pkg install.

Fix png header copy in travis yml

Another attempt to use png headers

Debug freeimage

Add jpeg library for freeimage and debug imread.

More debug for imread and freeimage

More freeimage and imread debugging

More debugging

Use correct paths for test env

Make sure imread is tied to libpng15

Add a TODO note for simpleitk test causing error.

Fix typo in yml

Cleanup and add more comments to travis yml

Update comment

Try and add 3.2 support.

Docstring formatting

Add more travis comments.

Try numpy 1.6 on python 2.7

Fix travis syntax error

Rename CONDA to ENV for clarity

Alias python on python 3.2

Use python 3.2 as the system python

Clean up libfreeimage install

Fix order on py3.2 pre_install

Move old numpy back to py26

Use the appropriate python calls.

Debug 3.2 build.

Update comment

Fix syntax error

Another fix for syntax error.

Install scipy after downloading import tools

More debugging for py32

Do not install conda on py3.2 (duh)

Fix typo in travis yml

Fix py32 qt install, separate pyfits and imread to find error

Fix syntax error and front-load option lib check for debug

pyfits is not supported in py3.2, try imread now

imread is also not supported on py3.2

install imread before pyfits to show relationship with libs

Make pip builds quiet

Minor formatting to retrigger build

Allow simpleitk to fail to download without breaking the build

Use travis_retry for SimpleITK

See what breaks when we keep libm in

Now remove libm again
Fix python 2.6 restoration/unwrap error
Move version_requirements to _shared and remove skipif from require.
Add documentation and rename import variable
Formatting fix.
Formatting and docstring cleanup.
Remove confusing dummy variable
Update comment
Improve import behavior for rag fallback
Add note in travis
Add travis_retry around the conda installs
Merge pull request #1084 from blink1073/miniconda-travis

Major Overhaul of Travis Build
Merge branch 'master' into import_export_pil_image_objects

fixing merge conficts

- incoming change to pil_plugin assumed PIL Image
  objects will always be from files; this is
  not always true anymore. Now pil_plugin
  checks to see if the Image came from a file
  before trying to close its associated file.

Conflicts:
	skimage/io/_plugins/pil_plugin.py