Adding Alias and Deprecation Warning

* Added alias and deprecation warning for
```skimage.filters.gabor_filter```.
* Added alias and deprecation warning for
```skimage.filters.gaussian_filter```.
* Updated ```TODO.txt```

TODO.txt

@@ -6,6 +6,8 @@ Version 0.14
 ------------
 * Remove deprecated ``ntiles_*` kwargs in ``equalize_adapthist``.
 * Remove deprecated ``skimage.restoration.nl_means_denoising``.
+* Remove deprecated ``skimage.filters.gaussian_filter``.
+* Remove deprecated ``skimage.filters.gabor_filter``.
 
 
 Version 0.13

skimage/filters/__init__.py

@@ -13,14 +13,18 @@
 from . import rank
 from .rank import median
 
-from .._shared.utils import deprecated
+from .._shared.utils import deprecated, copy_func
 from .. import restoration
 denoise_bilateral = deprecated('skimage.restoration.denoise_bilateral')\
                         (restoration.denoise_bilateral)
 denoise_tv_bregman = deprecated('skimage.restoration.denoise_tv_bregman')\
                         (restoration.denoise_tv_bregman)
 denoise_tv_chambolle = deprecated('skimage.restoration.denoise_tv_chambolle')\
                         (restoration.denoise_tv_chambolle)
+gaussian_filter = copy_func(gaussian, name='gaussian_filter')
+gaussian_filter = deprecated('skimage.filters.gaussian')(gaussian_filter)
+gabor_filter = copy_func(gabor, name='gabor_filter')
+gabor_filter = deprecated('skimage.filters.gabor')(gabor_filter)
 
 # Backward compatibility v<0.11
 @deprecated('skimage.feature.canny')