Renamed nodevers.install_helper.NodeInstaller to .NodeSourceInstaller.
Updated TODO.
Modified nodevers.python() and .gmake() to use for loops.
Added a function to get the list of all installable versions to
nodevers.shard.
Made changes to nodevers.install and .install_helper to use
nodevers.shared.get_remote_versions_list().
Updated error messages.
Added the ability to display installable versions.
Bug fix.
Bumped the version number.