Added support for "officialbin" installation source; linux only, downloads and installs official pre-built NodeJS binaries
Version bump & added description
Add license notice
Documentation updates
Get rid of rsync - verify SHA256 sum of downloaded file before installing
Bump version - use SHA256 checksums instead
Rename method to install_from_binary
Typo
Merge pull request #28 from JulesAU/master

Fixes #27 by offering installation from the official linux binary builds via nodejs.org