apply bundler gem template  #6

add gemspec, Gemfile, Gemfile.lock, LICENSE.txt

convert README.rdoc -> README.md

update .gitignore, Rakefile, Makefile

delete script/*, History.txt, lib/junk

move class Gyazz into module Gyazz::Client

use "minitest" gem for test

use "httparty" and "httmultiparty" gem to upload image