Add test suite for JavaScript

Can be run with `rake test_js`
JS: Story only calls methods on collection if present.
Run JavaScripts headless on travis
Start `rake test_js` as daemon
Move mark_all_as_read to under stories resource.
Open links in new tabs
Added instructions for setting up stringer on a VPS
Removed node.js dependency
Fixed some unintelligible rambling in VPS.md
Fixed a few typos in VPS.md
Merge branch 'master' of github.com:swanson/stringer
add some test for StoryView.
Merge branch 'pr/153'
Add javascript tests for rendering starred stories.
update localization files.
Merge pull request #168 from mickstephenson/master

Added instructions to VPS.md
Update readme [ci skip]
Update readme [ci skip]
add keyboard shortcuts screenshot. [ci skip]
Merge branch 'master' of github.com:swanson/stringer