Don't use snapshot service anymore

As google recently changed who their crawlers index pages [1], it isn't necessary anymore to use our snapshot service to deliver pages to its crawler.

This PR removes the redirection to the snapshot service and assures that the content is delivered directly to the crawler. We will then be able to remove the snapshot service itself.

Note that only google officially supports full rendering of SPA pages, so other crawlers don't get as much information as google...unless they change their ways. I think this is acceptable as google accounts for 95.5% of all search-engine based incoming requests (bing is second with 2.8%).

[1] http://googlewebmastercentral.blogspot.ch/2014/05/understanding-web-pages-better.html