RavenDB-2805 Do not fill in-memory queue when indexing is disabled or there is no index.
Merge pull request #1494 from arekais/RavenDB-2805

RavenDB-2805 Do not fill in-memory queue when indexing is disabled or th...
Making sure that we don't skip over existing documents if the export is saying we should
RavenDB-2842 for 2.5
Merge pull request #1506 from ppekrol/2.5

RavenDB-2842 for 2.5
Merge branch '2.5' of https://github.com/ayende/ravendb

Conflicts:
	Raven.Abstractions/Smuggler/SmugglerApiBase.cs
	Raven.Database/DocumentDatabase.cs
after merge cleanup
Merge pull request #1508 from ppekrol/master

2.5 to 3.0 merge