More XML Documentation for #21
Renamed a property in IPasswordValidationSettings

It made more sense for CustomSettings to be called CustomData because it
may not necessarily be settings that are passed in but general data that
allows the custom validation handler to operate. In fact, since any
object may be passed in (including objects that can query persistance
stores, etc. CustomData may not be the best name either)
Docs for Xander.PassowordValidatator assembly

Still got the Xander.PasswordValidator.Web assembly to do.
For #21 - Made a start on the .Web namespace
Added .DotSettings to repo

The .DotSettings file contains solution level settings for ReSharper's
code rules. Add this to the repository so that any future contributors
are using the same set of rules.