Tweaked the font and colors to match the website.
Fixed alignment of non-expandable topics.
Flattened the look of the tables and tabs.
Removed the HRs in the sections.
Added introduction section.
Cleaned up pages a bit.
Fixed some exceptions in the scripts.
Merge pull request #2518 from SickheadGames/docs

Documentation Style Fixes
Update Assimp library.
Merge pull request #2526 from JamesLupiani/Assimp

Update Assimp library.
Implemented several methods necessary for copying between bitmaps. Note: only copying between two PixelBitmapContent<T> where T is the same type has been implemented.
Added missing implementation for BitmapContent.ToString()
GraphicsUtil.CompressTexture no longer throws an exception for non-pow2 dxt textures if the GraphicsProfile is HiDef (this matches original XNA behavior).
TextureProcessor tries to set its pixel data to _bitmap. Bitmap only exists if the texture was loaded by the TextureImporter and even in that situation the pixeldata was already setup.
1st pass removing Lidgren from the build installer templates
Merge pull request #2527 from SickheadGames/SpriteSheetProcessorFixes

BitmapContent.Copy, PixelBitmapContent.CopyTo
Updated AssemblyInfo.cs to list each MG library by platform for easier discovery in the GAC
Correctly set TouchCollection.IsConnected based on TouchPanelCapabilities.IsConnected (not that that is correct yet).

Fixes #2531
Windows TouchPanelCapabilities MaximumTouchCount/IsConnected detection.
Android TouchPanelCapabilities MaximumTouchCount/IsConnected detection. These are sort of wrong due to API limitations, 2 means 2-4, 5 means 5+
Tidy up licence and usings in this file
iOS maximumTouchCount support. Harded coded values as found on google.
Linux and Mac have no touch support for now.
Touch count support for windows phone and PSM. PSM is just made up for now.