Run "bin/install.rb --help"

If you want to upgrade REXML (or install it as the default version of REXML)
run install.rb with no arguments.  If you want to have multiple versions of
REXML installed at the same time, run install.rb with the "-c" argument.  If
you do this, you will need to require REXML differently, since you will need
a "require" command that supports versioning.  This is installed with REXML;
all you need to do is:

	require "require_with_version"
	require "rexml"

or

	require( "rexml" ) { |v| v >= "2.7" }

to place restrictions on the version of REXML that you are loading.
