Merge pull request #228 from Therzok/master

Fix references to projects. ;D
Fixed bug that caused NRE to be thrown for Dialog Buttons.Add(new Xwt.DialogButton (Command.Ok) { Sensitive = false });
Because the dialog was not yet set when Sensitive = false was ran.
Implement password entry for GTK and WPF.
Merge pull request #230 from bojanrajkovic/password-entry-widget

Implement password entry for GTK and WPF
Added CurrentEventRow to TreeView.
This allows e.g. Toggled event handlers to know which row was changed.
It is also implemented for the Text cell renderer text changed events.
The Image and custom cell renderers were also changed to receive the TreeViewBackend, but do nothing with it at this point.
Other tree events (such as selected row changed) do not set the CurrentEventRow property.
This property is only implemented for the Gtk backend.
Fix GtkTestRunner so that test assembly is added to NUnit args

So far, tests haven't been run!
[Drawing API] Add ModifyCTM (Matrix m) to Xwt.Drawing.Context API

This provides the link between the Matrix transforms facilities and Drawing.Contexts
An sample of using this for specialised transforms has been added to DrawingTransforms.cs
and unit tests hve been aded to Testing/Tests/TransformTests.cs
Track api changes
Merge pull request #229 from mono-soc-2013/luiscubal-fix-dialog

Fixed NRE in Xwt for DialogButtons
Merge pull request #232 from hwthomas/master

[Drawing API] Add ModifyCTM to DrawingContext
Merge remote-tracking branch 'origin/master' into luiscubal-tri-state-cell-view
Xwt.sln: MacGtk test no longer included in Linux-Debug configuration.
Updated Checkbox State API.
Samples: Added event handlers to Checkboxes.
Added tri-state checkbox cell view API and implemented GTK backend.
Xwt: Made CheckBoxStateUtils internal
Merge pull request #233 from mono-soc-2013/luiscubal-tri-state-cell-view

Tristate checkboxes
[Tests] Don't add the test assembly if it has already been provided
[Mac] Track api changes in checkbox
[WPF] Track api changes
[Mac] Allow setting the mixed state even when AllowMixed=false