Squashed 'Raven.Voron/' changes from c4e1e0e..02f52ca

02f52ca Merge branch 'voron' of https://github.com/ayende/raven.voron into voron
1ec745e added Skip and GetDataSize introduced by Michael
c283ae9 Adding support for backing up the db

git-subtree-dir: Raven.Voron
git-subtree-split: 02f52ca744c2ea4ac3af3f9ad9ff422189db6990
Merge commit '66120b5731c202e2b49f1100898ebe8a258af15c' into 2.5-voron

Conflicts:
	Raven.Voron/Voron.Tests/Voron.Tests.csproj
	Raven.Voron/Voron/Impl/SnapshotReader.cs
	Raven.Voron/Voron/StorageEnvironment.cs
	Raven.Voron/Voron/Trees/Tree.cs
	Raven.Voron/Voron/Trees/TreeIterator.cs