Local patch
Rdc: External project added
Rdc: RdcStatsHadler added
Rdc: Farther development
Upload: Semi async reading
Upload: Removing unused code
Merged with fix-gh4. Fixes #4.
Refactor: Extracting writting to file task to external class
Rdc: Rdc manifest return
Rdc: Rdc signature handler added.
Refactor: Embeding rdc-service as submodule
Client: Adding ListenableStream. Fixes #3.
Merge remote-tracking branch 'origin/master' into replication

Conflicts:
	RavenFS.Tests/ClientUsage.cs
Rdc: StorageStream added - not tested yet
Client: Removing useless argument in DownloadAsync
Client: Partial download support
Utils: NarrowedStream tested
Rdc: Parital download implemented
Refactor: Small
Synchronizing: Preparing tests infrastructure