Add Update All button to Manage Packages dialog.
Update .nuspec for AvalonEdit 4.3.1 release.
Implemented SD-1853 - AvalonEdit: Distinguish between 'end of line' and 'start of next line' at word wrap positions

Also, the Home/End keys now apply to the current TextLine, not the whole VisualLine.
Fix TextView.GetVisualPosition() for positions with IsAtEndOfLine=true
Remove incorrect tooltip
Fixed caret navigation around characters outside the Basic Multilingual Plane (characters represented using surrogate pairs).
Compare IsAtEndOfLine in TextViewPosition.Equals
Fix handling of empty segments in TextSegmentReadOnlySectionProvider
Support updating all NuGet packages in solution from dialog
Refactor UpdatedPackagesViewModel.
Fix updated packages not being shown in dialog.

Updated packages were not being displayed in the
Manage Packages dialog when the solution was selected
and two or more projects had the same NuGet packages but
different versions.

http://nuget.codeplex.com/workitem/3034
Fix packages.config not being added to project.

NuGet's PhysicalFileSystem now has two AddFile methods
and both of these need to be overridden.
Clear dialog error messages when updating all NuGet packages.
Refresh Projects window after updating all NuGet packages.
Update installed NuGet packages after updating all packages in dialog.
Refresh updated NuGet packages after updating in dialog.
Support pre-release NuGet packages in dialog.
Fix scrollbar not displaying in Manage Packages dialog.
Add gap between Update All button and scrollbar.
Support installation of Microsoft.Bcl.Build NuGet package.

Add projects to MSBuild's global project collection if
the NuGet package has PowerShell scripts.

Add/Remove MSBuild project imports added to a project
held in MSBuild's global project collection after
the NuGet package has been installed.