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
Merge branch 'master' of https://github.com/dazerdude/SharpDX into pr109
Merge branch 'master_integration' of https://github.com/shoelzer/SharpDX into pr111
Merge branch 'master' of https://github.com/dazerdude/SharpDX into pr112
[SharpDX] Clean up comments in Matrix3x2
[SharpDX] Add Matrix3x2.Transformation()
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.
[SharpDX] Clean up comments in Matrix3x2
[SharpDX] Add Matrix3x2.Transformation()
[SharpDX] Fix issue with string marshaling on Windows Phone
[Build] Use merge instead of rebase from master to master_integration
Merge branch 'master' into master_integration
Added Option for CustomContentReader
Added an XmlContentReader Extension

XmlContentReader is a class which allows users to define custom types
and easily read data into them from well formed Xml data files.  It is
compatible with the SharpDX ContentManager implementation.