Committing the changelog

Author: pavanky

CHANGELOG.md

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+### v3.2.20151211
+- Feature parity with ArrayFire 3.2 libs
+    - New computer vision functions: `sift`, `gloh`, `homography`
+    - New graphics functions: `plot3`, `surface`
+    - Functions to load and save native images: `load_image_native`, `save_image_native`
+    - Use `unified` backend when possible
+
+- Added missing functions
+    - `eval`, `init`, `convolve2_separable`, `as_type` method
+    - `cuda` backend specific functions
+    - `opencl` backend specific functions
+    - `timeit` function to benchmark arrayfire functions
+
+- Added new examples
+    - getting_started: `intro`, `convolve`
+    - benchmarks: `bench_blas`, `bench_fft`
+    - financial: `monte_carlo_options`, `black_scholes`, `heston_model`
+    - graphics: `fractal`, `histogram`, `plot3d`, `conway`, `surface`
+
+- Bug fixes
+    - Fixed bug when array types were being reported incorrectly
+    - Fixed various bugs in graphics functions
+
+### v3.1.20151111
+- Feature parity with ArrayFire 3.1 libs
+- Ability to interop with other python libs
+- Ability to extract raw device pointers
+- Load and Save arrays from disk
+- Improved `__repr__` support
+
+### v3.0.20150914
+- Feature parity with ArrayFire 3.0 libs
+- Ability to switch all backends
+- Supports both python2 and python3