Centering the cursor at (width/2, height/2), effectively fixing
the issue described in https://github.com/mono/MonoGame/issues/2283
Merge pull request #85 from csantosbh/develop

Centering the cursor at (width/2, height/2) when the mouse is hidden
[GL] Added missing [Rgba]16Snorm texture formats

See https://www.opengl.org/sdk/docs/man4/html/glTexImage2D.xhtml or the
4.4 spec, section 8.5, table "Sized internal color formats".
[Build] Set revision to 0 outside source control

This ensures that properly built packages take precedence to incorrectly
built packages.
[Build] Updated copyright information