Minor fixes and improvements: PEP8, appearance, etc.

Removed a clumsy workaround (about paths)

Fixed links to image files to fix sphinx warning.

Removed non-ascii character

Another non ascii character

And another non-ascii character... (to be squashed later on)

Corrected some typos in the docstrings of sphinx-gallery files

These corrections have also been submitted as a patch to the original
sphinx-gallery project (#121)

Corrected the appearance of two examples of the gallery

Tweaked CSS for larger images

Added sphinx-gallery's license and a README.txt about the origin of
this directory.

Edited gabor_from_astronaut example for nicer popup

PEP 8 + minor fixes

Removed commented lines of code

doc/examples/xx_applications/plot_morphology.py

@@ -12,19 +12,12 @@ neighborhood around a pixel.
 In this document we outline the following basic morphological operations:
 
 1. Erosion
-
 2. Dilation
-
 3. Opening
-
 4. Closing
-
 5. White Tophat
-
 6. Black Tophat
-
 7. Skeletonize
-
 8. Convex Hull
 
 
@@ -46,6 +39,7 @@ ax.imshow(orig_phantom, cmap=plt.cm.gray)
 ######################################################################
 # Let's also define a convenience function for plotting comparisons:
 
+
 def plot_comparison(original, filtered, filter_name):
 
     fig, (ax1, ax2) = plt.subplots(ncols=2, figsize=(8, 4), sharex=True,
@@ -188,9 +182,9 @@ plot_comparison(phantom, b_tophat, 'black tophat')
 #
 # 1. Erosion <-> Dilation
 #
-# 2. Opening <-> Closing
+# 2. Opening <-> Closing
 #
-# 3. White tophat <-> Black tophat
+# 3. White tophat <-> Black tophat
 #
 #Skeletonize
 #===========