BUG: CreateTarball assumes /src/ is unique in path

If src appears earlier in path, it is returned by index instead
of the src within the SphinxExample dir.    This change updates
the index to instead search for SphinxExample.

Author: aylward

Utilities/CreateTarball.py

@@ -24,7 +24,7 @@
 cwd = os.getcwd()
 example_name = sys.argv[1]
 example_dir = os.path.join(cwd, example_name)
-example_idx = example_dir.index('/src/') + 1
+example_idx = example_dir.index('SphinxExamples') + 15
 html_output_dir = os.path.join(sys.argv[2], 'html', example_dir[example_idx:])
 
 if not os.path.exists( html_output_dir ):