ContentManager Bug Fix

Fixed a bug where load options were not being passed through to
IContentReader.ReadContent in
ContentManager.LoadAssetWithDynamicContentReader
Merge branch 'master' of https://github.com/dazerdude/SharpDX into pr109
Merge branch 'master_integration' of https://github.com/shoelzer/SharpDX into pr111
[SharpDX] Remove unnecessary implicit cast of Matrix3x2 to itself
[SharpDX] Clean up comments in Matrix3x2
[SharpDX] Add Matrix3x2.Transformation()