Refactored the code into the existing document class, to prevent introducing the complexity of two document types.
Moved the document class into a subfolder, updated all references
Added / updated unittests

Conflicts:
	library/Solarium/QueryType/Update/RequestBuilder.php

Conflicts:
	library/Solarium/QueryType/Select/Query/Component/Spellcheck.php

Tweaked readme file

- added some small fixes
- added unittests

Conflicts:
	library/Solarium/Exception/HttpException.php

Add body to HttpException (if available). Bad Request 400 is simply not sufficient to debug problems

Update composer.json

Use same PHP version as for Symfony component to match its requirements.

Conflicts:
	library/Solarium/Client/ResponseParser/Select/Component/FacetSet.php
	library/Solarium/QueryType/Select/Query/Component/FacetSet.php

* Since some Solr setups might configure their facets in
  solrconfig.xml, this option allows you to tell the
  response builder to construct the facet response from
  what is actually returned in the response rather than having
  to define it in the query object first.