Update gems
Add .cache to gitignore
Add execjs and rubyracer to Gemfile, should resolve #12
Merge pull request #16 from tripit/dev

Update gems and add execjs and therubyracer
Add ability to split content in include files.
Add explanation of partials to _errors.md
Add link in README to Build a Quine tutorial
Update jQuery to work over SSL, resolves #18
Update gems