fix NPE when no documents are returned; tweak isAnyOf queries, add a setting to override Spray's maxChunkSize for every request
response parser can finish parsing before the ChunkedMessageEnd message, this should lower the probability of a deadLetter
allow different implementations of ClientConnection to be used at runtime
add a SolrServerClientConnection actor that pretty much duplicates the interface of the regular (Spray) ClientConnection actor, specifically for using EmbeddedSolrServers in unit tests. Add an example HttpSolrServerConnectionProvider in the tests jar for test/example purposes