tempfiles will be automatically deleted after dispose
Merge branch 'master' of https://github.com/ayende/temp.raven.storage

Conflicts:
	Raven.Storage/Impl/Compactions/Compactor.cs
	Raven.Storage/Impl/FileSystem.cs
	Raven.Storage/Impl/StorageState.cs
fixed WillNotFindMissingValue bug