tweaks so tests run on ruby 1.9.3

use open_uri_redirections (patch for safe http->https redirects
use require_relative and add . to load_path in test.rb
Merge pull request #4 from lastobelus/ruby_193_tests

tweaks so tests run on ruby 1.9.3
add Michael Johnston to credits
1.3.3 pre
switch license to 2013
standardize (no space between meth name and args)
adopt the standard rufus gemspec/Rakefile
remove hard dependency on open_uri_redirections

Assume users load it at will.
switch to markdown readme
document @lastobelus redirection technique