Capitalisation of indexURL to indexUrl.
Capitalisation of indexURL to indexUrl.

fixes #3

RayHightower/rayhightower.github.octo-broken,RayHightower/rayhightower.github.octo-broken,RayHightower/lunrjs-sandbox-2,RayHightower/lunrjs-sandbox,wadaries/jekyll-lunr-js-search,RayHightower/lunrjs-sandbox-2,RayHightower/lunrjs-sandbox,simonellistonball/jekyll-lunr-js-search,slashdotdash/jekyll-lunr-js-search,jphastings/jekyll-lunr-js-search,wadaries/jekyll-lunr-js-search,slashdotdash/jekyll-lunr-js-search,jphastings/jekyll-lunr-js-search,simonellistonball/jekyll-lunr-js-search,yortz/octopress-lunr-js-search,RayHightower/rayhightower.github.octo-broken,yortz/octopress-lunr-js-search