Merge pull request #23 from odynvolk/master

Fix for Google pagerank check
Fix page_rankr for ruby 1.8.7.
Fix rspec deprecation.
Replace typheous.
Get google to stop being angry at me, so I can commit a working spec.
Make once explicit
Fix setup for vcr to better handle duplicate requests, because ruby 1.8.7 has unordered hash.
Update changelog
pass all variable to thread to ensure that variable remains available for life of thread.
synchonize on shared data structure.
Remove need for shared state
Add file so that bundler's require works because I didn't call the gem page_rankr originally.
Update readme
Change the proxy service usage to be more backward compatible.
Assign proxy on initialize to prevent thread contention on proxy service.
Improve messaging when nil is returned from PageRankr in specs.
Just list contributors.
Alexa country rank added
Clean up the alexa rank
Specify explicit ruby version