Multiple improvements / fixes

* Moved LocalizationExtensions.cs to an appropriate folder
* Split out all extensions to the LocMvc.Extensions namespace
* Removed configuration dependency from LocMvc.Extensions extensions
* Reconfigured extensions in the System and System.Web.Mvc namespaces to
call the LocMvc.Extension ones
* Added a Localization container control for use with ASPX and ASCX
pages. (for you non-mvc users)
* Fixed an issue where context values were not getting sanitized with
the rest of the contextual key.
* Adding LocASP package for nuget (contains appropriate configurations).