Fixed variable conflict affecting DirectX builds.
Merge branch 'usage' into stable_ARMED!
Merge pull request #1064 from SickheadGames/usage

Fixing DirectX Builds
Merge branch 'develop3d' into windesktop
Added initial WinForm platform and window stubs.
Fix minimizing Windows version
To address issue #1056
The window state would be changed back to normal when the window was minimized due to the code in UpdateWindowState being run when it shouldn't have. OnResize was being called with a window client size of 1x1 when minimizing the window.  The fix is to early out if the new client size is 1x1 to prevent changing the back buffer to the new client size and incorrectly causing UpdateWindowState to bring the window back.
Added comment to explain why the change.
Merge pull request #1066 from slygamer/issue1056

Fix minimizing Windows version
Merge branch 'develop3d' of https://github.com/mono/MonoGame into develop3d
* Added missing usage elements to VertexElement (Windows 8)
Windows 8 Storage fixes:

* Fixed BeginShowSelector / EndShowSelector not working.
* Fixed BeginOpenContainer / EndOpenContainer not working.
** Static variables added as a workaround for not being able to cast IAsyncResult to AsyncResult.

* Fixed StorageContainer methods throwing exceptions because there was no wait on the async methods.
* Fixed base path for StorageContainer
* Added a try/catch to StorageContainer.FileExists and StorageContainer.DirectoryExists
* Fixed OpenFile opening a Stream on the end of the file when the file existed.
Added PointMipLinear setting to SamplerState Activate.
SoundEffectInstance.Resume() restarts the audio if it finished playing (same behavior as in XNA)
Fix PSMobile compilation.

1. Changed line breaks in Effect.cs (caused compilation errors).
2. Add missing files to PSMobile.csproj file:

- ContentReaders\EffectMaterialReader.cs
- ContentReaders\ExternalReferenceReader.cs
- Graphics\Effect\EffectMaterial.cs
Fixed bug that was preventing the framebuffer from being created in the correct size on iOS.
Fixes orientation issues for devices that support multiple orientations, as well as a single (such as landscape only).
Merge pull request #1077 from WaaghMan/branch_soundeffect

SoundEffectInstance.Resume restarts the audio if it finished playing
Merge pull request #1075 from WaaghMan/branch_pointmip

Added PointMipLinear setting to SamplerState Activate.
Merge pull request #1073 from WaaghMan/branch_vertexelement

Added missing usage elements to VertexElement (Windows 8)
Merge pull request #1079 from liortal53/develop3d

Fix PSMobile compilation.