Updated MG to fix iOS 8 issues
CCScene: Make sure to UpdateResRatios when initialising
XS Project templates : Clean up

* Undoing all the bloating we had before.
* Keeping it simple with a single add-in xml and no solution/project files
CCScene: CalculateResRatio fixup

* WindowSize changes depending on the orientation, so the calculated ratio is specific to the particular orientation
* So when not using a custom res policy, we can set both LandscapeRatio and PortraitRatio to match
XS template: small fix to Mobile Empty Proj
CCMenu: make sure to pass on Scene to menuItems
CCLayer: UpdateBoundsRect before passing on BoundsChanged event
Removing outdated MD templates
Preparation for 1.2.0.0 release

* Updating assembly version
* Nuspec versions/release notes link
* PCL assembly version/ public CocosSharp API
* XS project template version
1.2.0.0 release notes
CS:Shared:Nuspec Change latest version 1.2.0.1

* NuGet timed out when pushing, and was not allowed to republish with same version number
* Pushing should be an atomic operation, so not sure why that was allowed
Fix #49 CCSimpleAudioEngine: Small music file plays twice
CCSpriteBatchNode: Setting default content size to be layer bounds

* Setting default to CCSize.Zero is bad, because it breaks the transformation chain
CCLayer/CCScene: Remove manual setting of anchorPointInPoints

* this is not required
CCLabelBMFont: Fixing alignment issue

* When not setting a label dimensions, the width when laying out the label should be the content size
* Some general cleanup as well
* Incorporating SpriteBatchNode changes so that we don't have to perform our own PositionTransform updates
XS Project templates: Mobile shared project rename

* Rename shared project to {$ProjectName}.Common so that it doesn't match the solution name
Fix assert in SpriteChildrenVisibilityIssue665 test.
XS Project templates: Fixing up layout of Mobile projects

* thanks to Matt Ward for the help!
* previously all projects (iOS/Android/Common) shared a common packages dir
* this was bad because that means all projects get all packages
* also fixing up Namespace to use SolutionName so that its consistent across projects
* it seems setting namespace tag within template is not respected