fix bugs in rendering empty IsAnyOfs and empty NOTs; add an isNoneOf method
0.9.1 release
prepare next development version
Merge branch 'release/0.9'

Conflicts:
	src/main/scala/com/codemettle/akkasolr/querybuilder/SolrQueryStringBuilder.scala
	src/test/scala/com/codemettle/akkasolr/querybuilder/TestSolrQueryStringBuilder.scala
load-balance / solrcloud will be release 0.10.0 - made small changes that are technically incompatible with 0.9