Fixed a few warnings with XML comments
Added missing XML comments for Matrix3d
Fixed a few small issues in XML comments for Matrix4d

--HG--
extra : rebase_source : 18595a2fc57dcf7ff0f61d699e092be036d65157
Added missing XML comments for Matrix3d
Merge pull request #5 from Tamschi/master

XML comments
Fix NullPointerException on Windows 8.
Merge pull request #6 from shrt/master

Keyboard NullPointerException fix
Merge branch 'master' of github.com:andykorth/opentk

Conflicts:
	Source/OpenTK/Math/Matrix3.cs
	Source/OpenTK/Math/Matrix3d.cs