update ruby
add ability to review previously run WPT results via results URL
update README
use json to call results
Merge branch 'review_results'
Revert "use json to call results"

This reverts commit de5413216785cf6b19a02a46d1cbae896aa276e0.
up version
Adding missing keys to example
Added ability to use a private instance of webpagetest
Allow for tests against private instances and parse the results of multiple execution runs correctly.  Note that the result initializer changed somewhat as it now takes the full url for the test results page.