Introduced the concept of a study.  A mechanism that allows the dev to easily setup a usability study by calling a single method within their layout file.
Added dummy app for testing of Turkee view helpers.
workerId and assignmentId are now persisted through cookies so that a study can be completed beyond the initial HIT page.
Instituted a gold standard question for the study based on the feedback that the user entered.  Helps to check whether they're human or not and also forces the Turker to review the feedback that they entered.
Changed format of directions header
Updated gemspec to 2.0.0.
Fixed approve? spec. Wrong index value.
Updated README
Merge branch 'feature-999999-railsconf_demo'