Fixed icon markup.
A few more tweaks to the readme.
Don't start playing a SoundEffectInstance all over again if it's already playing
Fixed PlayPosition on Windows 8
Fixed render targets on WP8
Since the MonoTouch bug was fixed with the sensor events, we can revert to using their data
Merge branch 'develop3d' of https://github.com/mono/MonoGame into w8_play
Reapply
Merge pull request #1330 from Nezz/w8_playposition

Fixed PlayPosition on Windows 8
Merge pull request #1328 from Nezz/w8_play

SoundEffectInstance play bugfix
Merge pull request #1333 from Nezz/ios_sensors

Use sensor data on iOS
Merge pull request #1331 from Nezz/wp8_rendertarget

Fixed render targets on WP8
Handles generic content type writers and readers
BuiltInContentWriter generates the correct typename for the generic content reader.
ContentWriter adds generic type arguments to list of referenced types.
Remove commented out code that is not necessary.
Merge pull request #1341 from slygamer/pipeline

Handles generic content type writers and readers