Installer (IIS) - the virtual directory field is no longer required, empty value will cause that Raven will be installed at a root path of a website.
Fixing test
Combine files related to tests to one file
minor
Merge branch 'master' of github.com:ravendb/ravendb into 2.5

Conflicts:
	Raven.Tests/MailingList/Idsa/IdsaTest.cs
Also assert the behavior of the test, so if we will change this we will have a failing test