Add flags/switches

Dependency, "simple-argparse", has been updated to be able to process
switches in command line arguments. It has been updated in
"package.json".

"README.md" has been updated to offer more information on the usage of
the tool.

"index.js" and "lib/index.js" and "lib/cache.js" have been updated to
implement saving the installed package to a project's package.json.

Gemnasium Badge has also been added to "README.md"