Improvement pack for monogame.
Added an overload to SpriteBatch.Draw()
Revised comment and removed pointless newline
Added summary of overload and descriptions of default values
Merge pull request #1810 from Shqrdx/develop

Improvement pack for monogame.
Changed null value check to use HasValue
Merge pull request #1833 from cmark89/simpledraw

Added an overload to SpriteBatch.Draw()
Merge branch 'develop' of git://github.com/mono/MonoGame into monogame-sdl2