Allow boundParams to be also integers, booleans.

[jtomaszewski]

I just spent 1 hour thinking why my collection's array isn't being cached.

That was because:

1. first I forgot (didn't know) to set resource's params like {id: '@id'}
2. Then it appeared that only string values are being cached, but my id: values were integers, so they didn't cache at all.

[hazeledmands]

thanks :)

[hazeledmands]

Thanks for the awesome PR! You're right; the documentation for this project needs a lot of love.

[jtomaszewski]

Thanks for merging this! The project is great and the only thing it needs right now is a lot of stars and watchers on GitHub ;)