Update imgAltNotPlaceHolder.rst

Cleaned up documentation for imgAltNotPlaceHolder.
Added grunt-gh-pages. Copies the contents of dist/ to a public_html/ directory in the master branch. The public_html/ directory is ignored in .gitignore.

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>
Added a grunt task to build the gh-pages branch from the master branch dist directory. A Gemfile is added to this directory for faster local development.

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>
Merge branch 'refs/heads/kevee/yaml-config' into jessebeach/yaml-config