Adding service description
 RavenDB-1200 Make sure that installer does not try to use Raven.Server.exe to uninstall service if the file is does not exist. In order to ensure that the service will be removed in that case we use 'sc' command line tool.
Merge branch 'RavenDB-1200-for-2.5' of https://github.com/arekais/ravendb into 2.5
Merge branch 'temp' of github.com:ayende/ravendb into 2.5
Remove the dependency on Microsoft.CompilerServices.AsyncTargetingPack for .NET 4.5 and .NET 4.5.1 projects.
This is possible by using a feature of NuGet 2.0 which allow us to specify dependencies per platform.
Fixing the build
Merge branch '2.5' of https://github.com/fitzchak/ravendb into 2.5
Add overload to AsyncLuceneQuery taking index via a type parameter.
Implement new overload on AsyncDocumentSession as well (Git fail).
Merge branch '2.5' of https://github.com/CMircea/RavenDB into 2.5