Merge pull request #1 from cajetanus/master

Update eschwab's fork with cajetanus:master
Added gregorio-next-parens and gregorio-prev-parens for faster navigation.
      - Remapped the keybind for forward-sexp to gregorio-next-parens.
      - Remapped the keyding for backward-sexp to gregorio-prev-parens.
      - This only effects the gregorio-mode keymap.

Added gregorio-fill-parens for easily filling empty parentheses.
      - Bound C-c f to gregorio-fill-parens.

Updated HTML Documentation
Merge pull request #6 from eschwab/master

Added navigation functions and one helper function.