Slightly better organized roadmap doc

Documentation/GitHub/roadmap.md

@@ -2,6 +2,8 @@
 
 **Current version: v0.2**
 
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 Banshee is currently in development, and the focus right now is to finish the most important high level systems so that people can start using it to create games as soon as possible. These systems are:
  - Physics (colliders, triggers, rigidbodies, joints, character controller)
  - Animation (skeletal, blend shapes, generic script variables)
@@ -9,6 +11,8 @@ Banshee is currently in development, and the focus right now is to finish the mo
  
 The plan is to finish these roughly around mid-2016.
 
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 Quickly to follow will be:
  - Ports for Linux & Mac
  - Vulkan (and possibly DX12) implementation
@@ -17,6 +21,8 @@ Quickly to follow will be:
  
 These are planned for an early 2017 release.
 
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 There are many more features planned, but these are without a specific timeline or order:
  - Mobile render API (likely Vulkan, possibly Metal for iOS)
  - Android/iOS/WP ports