Add release notes for version 0.8

doc/release/release_0.8.txt

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+Announcement: scikits-image 0.8.0
+=================================
+
+We're happy to announce the 8th version of scikit-image!
+
+scikit-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://scikit-image.org
+
+
+New Features
+------------
+
+- New rank filter package with many new functions and a very fast underlying
+  local histogram algorithm, especially for large structuring elements
+  `skimage.filter.rank.*`
+- New function for small object removal
+  `skimage.morphology.remove_small_objects`
+- New circular hough transformation `skimage.transform.hough_circle`
+- New function to draw circle perimeter `skimage.draw.circle_perimeter` and
+  ellipse perimeter `skimage.draw.ellipse_perimeter`
+- New dense DAISY feature descriptor `skimage.feature.daisy`
+- New bilateral filter `skimage.filter.denoise_bilateral`
+- New faster TV denoising filter based on split-Bregman algorithm
+  `skimage.filter.denoise_tv_bregman`
+- New linear hough peak detection `skimage.transform.hough_peaks`
+- New Scharr edge detection `skimage.filter.scharr`
+- New geometric image scaling as convenience function
+  `skimage.transform.rescale`
+- New theme for documentation and website
+- Faster median filter through vectorization `skimage.filter.median_filter`
+- Grayscale images supported for SLIC segmentation
+- Unified peak detection with more options `skimage.feature.peak_local_max`
+- `imread` can read images via URL and knows more formats `skimage.io.imread`
+
+Additionally, this release adds lots of bug fixes, new examples, and
+performance enhancements.
+
+
+Contributors to this release
+----------------------------
+
+This release was only possible due to the efforts of many contributors, both
+new and old.
+
+- Adam Ginsburg
+- Anders Boesen Lindbo Larsen
+- Andreas Mueller
+- Christoph Gohlke
+- Christos Psaltis
+- Colin Lea
+- François Boulogne
+- Jan Margeta
+- Johannes Schönberger
+- Josh Warner (Mac)
+- Juan Nunez-Iglesias
+- Luis Pedro Coelho
+- Marianne Corvellec
+- Matt McCormick
+- Nicolas Pinto
+- Olivier Debeir
+- Paul Ivanov
+- Sergey Karayev
+- Stefan van der Walt
+- Steven Silvester
+- Thouis (Ray) Jones
+- Tony S Yu