ContentManager Bug Fix

Fixed a bug where load options were not being passed through to
IContentReader.ReadContent in
ContentManager.LoadAssetWithDynamicContentReader
[SharpDX] Fix comment for Matrix3x2.TranslationVector
ModelCompiler Bug Fix

Fixed a bug where the ModelCompiler would create a vertex layout with
duplicated Normal0 semantics when Assimp.Net loaded a Scene which
included both Vertex Colors and Normal Data.
Merge branch 'master' of https://github.com/dazerdude/SharpDX into pr112