Merge pull request #1 from mono/develop

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Monthly Merge!
Merge pull request #6 from mono/develop

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Merge pull request #7 from mono/develop

September update
Merge pull request #8 from mono/develop

Pre-LD Update
A quick fix to only fire back button events on Windows Phone if they weren't handled/fired yet
Merge pull request #9 from mono/develop

Update from develop
Aspect ratio now returns correct value

- Dividing two ints does not make a float!
Reduce frame latency for WP8

This brings to WP8 the same behavior we have for other Win8/DX targets.
Revert "Reduce frame latency for WP8"

This reverts commit 9f8a1a15b3d089d4eabb5993e6244546d6b951a9.
Reduce frame latency for WP8

Move code to UpdateDevice(...) which is in the execution path of both
DrawingSurface & DrawingSurfaceBackgroundGrid.
Merge pull request #2210 from nkast/tnc_WP8ReduceFrameLatency

Reduce frame latency for WP8
Merge pull request #2203 from Nezz/wp8_backfix

WP back button cancel fix
Merge pull request #2209 from GarethIW/aspectratio-fix

DisplayMode.AspectRatio fix
Updated libs submodule.
Merge branch 'fbxfix' of github.com:SickheadGames/MonoGame into fbxfix
Merge pull request #2215 from SickheadGames/fbxfix

Content Pipeline Fixes