Merge pull request #3 from Fuco1/master

Add mp4-to-mp3 recipe.
recipes/mp4/to-mp3/Makefile: update install-tools

Updates #3.
recipes/md/to-html/Makefile: quote $@, $<
recipes/ogv/crop/Makefile: quote $@, $<
recipes/flac/to-mp3/Makefile: quote $@, $<
recipes/cue/split/Makefile: quote $@, $<
recipes/ogv/to-gif/Makefile: quote $@, $<
recipes/svg/to-png/Makefile: quote $@, $<
recipes/ogv/trim/Makefile: quote $@, $<

Fixes #2.
README.md: add to recipes list
recipes/svg/to-png/Makefile: update install-tools
make-it-so.el: update comments
README.md: add
make-it-so.el (make-it-so): account for `wdired-mode'
make-it-so.el (mis-select-method): add

* make-it-so.el (make-it-so): Dispatch according to `mis-select-method'.
  (mis--helm): New function.
  (mis--ido): New function.

Fixes #1.
make-it-so.el (mis-recipes-by-ext): handle null extensions