DOC: Add 0.6 release notes.

doc/release/release_0.6.txt

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+Announcement: scikits-image 0.6
+===============================
+
+We're happy to announce the 6th version of scikits-image!
+
+Scikits-image is an image processing toolbox for SciPy that includes algorithms
+for segmentation, geometric transformations, color space manipulation,
+analysis, filtering, morphology, feature detection, and more.
+
+For more information, examples, and documentation, please visit our website
+
+  http://skimage.org
+
+New Features
+------------
+- Packaged in Debian as ``python-skimage``
+- Template matching
+- Fast user-defined image warping
+- Adaptive thresholding
+- Structural similarity index
+- Polygon, circle and ellipse drawing
+- Peak detection
+- Region properties
+- TiffFile I/O plugin
+
+... along with some bug fixes and performance tweaks.
+
+Contributors to this release
+----------------------------
+- Vincent Albufera
+- David Cournapeau
+- Christoph Gohlke
+- Emmanuelle Gouillart
+- Pieter Holtzhausen
+- Zachary Pincus
+- Johannes Schönberger
+- Tom (tangofoxtrotmike)
+- James Turner
+- Stefan van der Walt
+- Tony S Yu