Created new Lucene search app page, added to index.rst
add full path to lucene_index
Correction to file indexing: local only
Small corrections
Merge branch 'lucene' of https://github.com/owncloud/documentation into lucene

Conflicts:
	admin_manual/configuration/configuring_search.rst
Merge pull request #597 from owncloud/lucene

Created new Lucene search app page, added to index.rst