Remove Cool.io::HttpClient from README
travis-ci: use 2.1 to support all 2.1 environments
add build script.
move jrubyVersion to build.gradle.
add eclipse specific settings.
modify Rakefile for JRuby and add minimum skelton java codes for rspec.
split Watchers.
add Loop skeleton.
use standard api instead of platform dependent literal.
add Utils.
add IOBuffer