Starting to test some controller

* BlogUnitTest.cs: Should test the user registration

* NpgsqlBlogProvider.cs: Fixes usage of Npgsql upgrade to latest
  version

* TestAPI.csproj: switch to .Net framework 4.5.1

* AccountController.cs: refactoring password validation

* CalendarController.cs:
* WorkFlowController.cs: SendActivationMessage became an extension
  method

* style.css: menu items already have a background and color, since
  they're `<A>` tags

* Unregister.aspx:
* AccountController.cs: refactoring user registration

* BlogsController.cs: Fixes a confusion between Author and reader ...

* YavscHelpers.cs: refactoring the password reset

* App.master: no more <div class="menuitem">, they're hyperlinks

* Login.aspx:
* Profile.aspx: refactoring the user registration

* BlogEntryCollection.cs: implements a method to filter a given post
  collection in order to be displayed tu a given user or anonymous

web/Views/Account/Login.aspx

@@ -20,7 +20,7 @@
 <input type="submit"/>
 <% } %></div>
 <div class="panel">
-<%= Html.ActionLink("S'enregistrer","Register",new {returnUrl=ViewData["returnUrl"]}, new { @class="actionlink" }) %>
+<%= Html.ActionLink("S'enregistrer","RegisterForm",new {returnUrl=ViewData["returnUrl"]}, new { @class="actionlink" }) %>
 </div>
 <div class="panel">
 <a href="<%=Request.Url.Scheme + "://" + Request.Url.Authority + "/Google/Login"%>?returnUrl=<%=ViewData["returnUrl"]==null?Request.Url.PathAndQuery:(string)ViewData["returnUrl"]%>" class="actionlink">

web/Views/Account/Profile.aspx

@@ -112,7 +112,7 @@ Avatar : <img class="avatar" src="<%=Model.avatar%>?version=<%=Html.Encode(DateT
 <% } %>
    <aside>
    <%= Html.ActionLink("Changer de mot de passe","ChangePassword", "Account",null, new { @class="actionlink" })%>
-   <%= Html.ActionLink("Désincription","Unregister", "Account",null, new { @class="actionlink" })%>
+   <%= Html.ActionLink("Désincription","Unregister", "Account",  new { id=ViewData["UserName"] } , new { @class="actionlink" })%>
    </aside>
    <aside>
    <% 	if (Roles.IsUserInRole((string)ViewData ["UserName"],"Admin")) { %>

web/Views/Account/Unregister.aspx

@@ -7,5 +7,6 @@ Warning: This will delete all of your data here, your profile, your posts and ot
    <label for="confirmed">Unregister</label> 
    <%=Html.CheckBox("confirmed")%>
    <input type="submit"/>
+   <%= Html.Hidden("UserName") %>
    <% } %>
 </asp:Content>