Minor typo fixes

- s/cldr-data/cldr-data-downloader/;
- s/e.g,/e.g.,/;
Minor changes

- Add banner on all js files;
- Remove rimraf from the list of dependencies;
- Remove unused path on index.js;
- Change s/**/**.js/ on the list of files to jshint;
Include executable ./bin/download.js

Fixes #1