Fix some sphinx warnings and add to build

Fix some sphinx warnings

Add documentation build to test

Add documentation build to test

Remove change in numpydoc

Remove change in apigen

Add makefile target for html and add to travis script

Add a makefile target for html and add to travis script

Fix more sphinx warnings

skimage/segmentation/boundaries.py

@@ -65,15 +65,15 @@ def find_boundaries(label_img, connectivity=1, mode='thick', background=0):
         How to mark the boundaries:
 
         - thick: any pixel not completely surrounded by pixels of the
-        same label (defined by `connectivity`) is marked as a boundary.
-        This results in boundaries that are 2 pixels thick.
+          same label (defined by `connectivity`) is marked as a boundary.
+          This results in boundaries that are 2 pixels thick.
         - inner: outline the pixels *just inside* of objects, leaving
-        background pixels untouched.
+          background pixels untouched.
         - outer: outline pixels in the background around object
-        boundaries. When two objects touch, their boundary is also
-        marked.
+          boundaries. When two objects touch, their boundary is also
+          marked.
         - subpixel: return a doubled image, with pixels *between* the
-        original pixels marked as boundary where appropriate.
+          original pixels marked as boundary where appropriate.
     background: int, optional
         For modes 'inner' and 'outer', a definition of a background
         label is required. See `mode` for descriptions of these two.
@@ -197,7 +197,7 @@ def mark_boundaries(image, label_img, color=(1, 1, 0),
 
     See Also
     --------
-    ``find_boundaries``.
+    find_boundaries
     """
     marked = img_as_float(image, force_copy=True)
     if marked.ndim == 2: