Creates new block that provides simple search within a collection.

This block is created using an islandora_solr hook, so it gets
registered with that modules blocks.

The new block replaces the simple search block in the basic collection
template.

Alos adds tests that this blovk exists and that it scopes the search.
Merge pull request #6 from lyrasis/fix-overzealous-search-scoping

Creates new block that provides simple search within a collection.

Pull request https://github.com/lyrasis/islandora_solr_search/pull/2 also required.