Commented out methods/accessors that were purely stubs.
Replaced incorrect usages of NotImplementedException with ArgumentException and NotSupportedException.
Implemented GraphicsDeviceManager.BeginDraw/EndDraw().
Implemented DisplayModeCollection.GetEnumerator().
Removed unnessasary DisplayModeCollection.GetHashCode() override.
Implemented EffectParameter.GetValueMatrixArray().
Implemented EffectParameter.GetValueTextureCube().
Implemented EffectParameter.SetValue(Quaternion).
Implemented EffectParameter.GetValueQuaternion().
Removed PowerStatus
And PowerLineStatus and BatteryCharge files.
These were part of XNA 3.0 and removed in 4.0.
Merge pull request #1986 from KonajuGames/powerstatus

Removed PowerStatus
Implemented AudioCategory.Equals() and associated equality methods.
Implemented AutioCategory.ToString().
Merge branch 'develop' into nie
Commented more methods in NetworkSession that were purely stubs.
Fixed missing using statement.
Commented out more stub methods.
Merge pull request #1985 from SickheadGames/nie

NotImplementedException Cleanup
Merge pull request #1967 from SickheadGames/BlendStateToString

Improving BlendState/RasterizerState/DepthStencilState.ToString()
Merge branch 'develop' into stable_BtA