Home page Credentials (sponsors & testimonials) Section

Here is an initial implementation of a Credentials section on the locoCMSsite homepage.  For now the sponsors are added manually to the homepage as editable file sections, this could easily be updated to a content type when more sponsors are needed dynamically in the future.  

Testimonials are a content type so you can add a bunch easily.  They are displayed in groups of 3 in the jquery bxslider that is responsive so it adjusts with the site.  A testimonial has two url fields, one labeled "Url" and one "Page Link".  "Url" is for adding a link to and external site of the testifier, while "Page Link" is for internal links to longer testimonials / case studies or examples.  This may be a bit fragile depending on how the internal links span across the different sites, I think it might be best just to make both require an absolute path (sorry, just thinking of this now with the pull request and I can fix it and submit a new request)

I have tested with locally and everything works.

Please let me know if you have any comments/questions/concerns.
Thanks,
Robert