RavenDB-2777 Error on map reduce index much earlier to avoid data file growth
RavenDB-2797 When creating a new filesystem, allow to select storage engine
RavenDB-2798 Download button in filesystem
Merge branch 'RavenDB_2797' of https://github.com/ml054/ravendb
Merge branch 'RavenDB-2777' of https://github.com/arekais/ravendb