update grunt-contrib-imagemin. from ~0.2.0 to ~0.4.0 due to heroku compile problems
add heroku-buildpack-imgpack to build GIFSICLE
try custom fix to grunt-contrib-imagemin
try to fix gifsicle problems
fix gifslice version to be able to deploy to heroku
add rake to Gemfile
configure bundle to use path vendor/bundle
fix jekyll exclude vendor path
add http server for heroku based on PUMA
move dist to public to be compatible with pow