Merge pull request #5 from julien-c/master

Make cache TTL configurable
"Debounce" requests.
Use Redis Cloud by default.
Clean up redis config, add in-memory caching as fallback and cache the cache_exp value.
Remove link to backup API
Upgrade to jQuery 1.8.3 + fixes
Remove extra blank line
Specify "main" file
Remove "node" entry in package.json