Replaced index.html with .gitignore in _cache folder.
All files within _cache will be ignored by git from now on.
It also makes sense to disable http access to that directory, but that should be achieved by using the necessary rules in .htaccess in jobberbase, not here.
Merge pull request #1 from rimas-kudelis/gitignore

Replaced index.html with .gitignore in _cache folder.