Add the possibility to modify the query and results
Change the way the Elastica_Search object is created

This way we will have more flexibility to modify the search.
We will be able to support multiple index, multi-types and others.
Add a filter to modify the search

Will be able to use all the Elastica_Search API.
Merge branch 'add_filters'
Fix namespace
Merge branch 'search_multiple_index'