Merge pull request #55 from mvar/cleanup

docs/Filter/Bool.md

docs/Filter/index.md

docs/HowTo/HowToSearch.md

src/Aggregation/FilterAggregation.php

src/Search.php

src/SearchEndpoint/AggregationsEndpoint.php

src/SearchEndpoint/PostFilterEndpoint.php

src/SearchEndpoint/QueryEndpoint.php

src/SearchEndpoint/SearchEndpointInterface.php