Fixes Texture2D.GetData to consider row pitch.

Fixes Texture2D.GetData to consider row pitch on DirectX version.
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' of https://github.com/mono/MonoGame into develop
Merge branch 'develop' into toRelease
evelop' into toRelease

Conflicts:
	MonoGame.Framework/Graphics/Texture2D.cs

Conflicts:
	MonoGame.Framework/Graphics/Texture2D.cs