add new files
add trial_form layout template, js file, and sass file, refactor free trial template, sass, and js code into trial_form layout code
add ab-testing page in resources
pull master and resolve merge conlfict
refactor for PR, move footer image to template
Merge pull request #323 from optimizely/dfoxpowell/resources-split-testing-tool

Dfoxpowell/resources split testing tool