DOC: Index Wiki examples with Doxygen.

The wiki examples are indexed by doxygen so they will automatically be listed
with the class documentation and show up on the "Examples" tab page of
Doxygen.

ITK-3309.

Change-Id: I44245e1189c6d1fe7b585ba153c9d7f78efe58f5
COMP: Bump SphinxExamples remote module.

Fixes a CMake configuration error.

Change-Id: Ic1b09811748fa670e559e4f1b1c137d472f3b4f3
DOC: Index Sphinx examples in Doxygen.

The Sphinx examples are indexed by doxygen in the "Examples" tab and
are automatically cross-indexed in all the classes that they use.

ITK-3309.

Change-Id: Ic285cea7e65c348e9a978205c11d9684015acfc6
Merge topic 'doxygen-examples'

ade05411 DOC: Index Sphinx examples in Doxygen.
54299208 COMP: Bump SphinxExamples remote module.
0dc92b48 DOC: Index Wiki examples with Doxygen.