Don't overwrite underscore.js, whitespace fixes.
Merge remote-tracking branch 'upstream/master'
Fix a minor bug in the playground app, resulting in 404's in some cases.

For some reason, the browser keeps appending a trailing '/' at the end
of the URLs. Since the loadExample function in playground.js parses the
request parameter itself and uses it to load the JSON, a trailing '/' at
the end of the URL causes the function to generate a request for a JSON
named '.json'.

The PR adds a check for a trailing '/' and taking appropriate action if
there is a trailing slash.
Merge pull request #4 from abhinav-upadhyay/fix-playground

Fix a minor bug in the playground app, resulting in 404's in some cases.
Merge pull request #5 from Textalk/master

Don't overwrite underscore.js if it is already loaded
Merge pull request #5 from Textalk/master

Conflicts:
	playground/playground.js