canvastools subpackage for scikit-image viewer

[Tony Yu]

About a month-or-so ago, I promised I would start work on selection tool
for the image viewer. I finally got around to it. I ended up doing a pretty
significant overhaul, but I think it was worth it.

See PR # 390 <https://github.com/scikit-image/scikit-image/pull/390>

I'll copy my PR message below, just for completeness:


Major overhaul of tools for interacting with the scikit-image viewer.

* Add skimage.viewer.canvastools subpackage with line and rectangle
selection tools
* Refactor line profile plugin to use line tool
* Fix viewer canvas
* Fix blitting behavior
* New plugins (ColorHistogram, Measure, Crop)

To get a feel for the changes, see new examples in
`viewer_examples/plugins` located in the root directory of package.

Cheers,
-Tony
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