Merge pull request #550 from jeff1evesque/gitignore

#549: .gitignore, ignore '.sass-cache/' subdirectory
#551: index.php, update reference to to 'style.min.css'
Merge pull request #552 from jeff1evesque/php_index

#551: index.php, update reference to to 'style.min.css'
#483: imagemin, update nodejs related files
#483: imagemin, additional imagemin files
#483: imagemin, remove node project
#483: imagemin, install for CLI
Merge pull request #554 from jeff1evesque/imagemin

#483: Install Imagemin
#553: Bash 'web', add comment
#553: Bash 'web', add outer loop to minify images
#553: Bash 'web', get image filenames
#553: Bash 'web', add comment
#553: Bash 'web', add 'imagemin' logic
#553: Bash 'web', create 'asset/img/' subdirectory if doesn't exist
#553: Bash 'web', proper logic to minify images
#553: Bash 'web', add comment
Merge pull request #555 from jeff1evesque/bash_web

#553: Minify images to 'asset/img/' subdirectory
#482: uglifyjs, remove unnecessary components
Merge pull request #556 from jeff1evesque/uglifyjs

#482: uglifyjs, remove unnecessary components
#557: README.md, update 'linux packages' subsection