DOC: Add v0.5 release notes.

doc/release/release_0.5.txt

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+Announcement: scikits-image 0.5
+===============================
+
+We're happy to announce the 0.5 release of scikits-image, our image processing
+toolbox for SciPy.
+
+For more information, please visit our website
+
+  http://scikits-image.org
+
+New Features
+------------
+- Consistent intensity rescaling and improved range conversion.
+- Random walker segmentation.
+- Harris corner detection.
+- Otsu thresholding.
+- Block views, window views and montage.
+- Plugin for Christoph Golke's "tifffile".
+- Peak detection.
+- Improved FreeImage wrappers and meta-data reading.
+- 8-neighbor and background labelling.
+
+... along with updates to the documentation and website, and a number of bug
+fixes.
+
+Contributors to this release
+----------------------------
+* Andreas Mueller
+* Brian Holt
+* Christoph Gohlke
+* Emmanuelle Gouillart
+* Michael Aye
+* Nelle Varoquaux
+* Nicolas Pinto
+* Nicolas Poilvert
+* Pieter Holtzhausen
+* Stefan van der Walt
+* Tony S Yu
+* Warren Weckesser
+* Zachary Pincus