added baseurl to the indexed entities so fixing issues when baseurl is d...

...ifferent than empty such as when deploying on github pages.

I had problems when deploying on github pages as the search result links needs the baseurl to be set. So to have it on mustache template I changed the indexer to pass the baseurl taken from the project _config.yml.
I have also changed the url for getting the date.format bower dependency for making rake build to work.

Could you please review and merge to master if you find relevant?

Cheers