Scene Hierarchy Multi Selection

New update on the scene hierarchy (multi selection)
Tutorials Window

Min Width added
Merge pull request #8 from Whitebeard86/Tutorials-Window

Tutorials Window
Scene View & Inspector Changes

Scene View: Scale is now a Vector2 instead of a float - nonuniform
scale;
Inspector: Fixed increment/decrement button colours (Xceed).
License Files

Adds the license header to all project files.
Update LICENSE.txt
Update README.md
Update README.md
Merge pull request #6 from Whitebeard86/master

Update