Merge pull request #2150 from ddfreyne/nanoc-fix

Nanoc: Fix capitalisation + config filename

Nanoc.gitignore

-# For projects using nanoc (http://nanoc.ws/)
+# For projects using Nanoc (http://nanoc.ws/)
 
-# Default location for output, needs to match output_dir's value found in config.yaml
+# Default location for output (needs to match output_dir's value found in nanoc.yaml)
 output/
 
 # Temporary file directory