NRE fix
RavenDB-1205 Exposed 'Explain' feature of Lucene to use via LuceneQuery and DatabaseCommands.Query
RavenDB-1205 Adding tests for async querying
Merge branch 'RavenDB-1237' of https://github.com/ppekrol/ravendb into 3.0
added license check for fips
truncating sha1 hashes to 16 bytes