Added a Scene2DDebugRenderer.
Made colours configurable.
Table debug rendering included.
Small JavaDoc change.
Actors now know themselves how to debug render. Adjusted all tests. Added a new Scene2DDebugRendererTest.
Conflicts resolved.
Removed an unused method.
Small bugfix and renamed fields.
Removed the final modifiers for colors.
Added missing Decal.setRotation method.
Update Intersector.java

Added method for getting intersection point for two 2D rays.
Added angle calculation methods to Vector2

Added two methods to the Vector2 class, allowing to calculate angle between two vectors, and not only between the x-axis.

I'm not using the standard acos solution, math explained here: http://geomalgorithms.com/vector_products.html

Since the dot product is the cosine of the angle between two vectors, and the 2d cross product (perp dot) is the sine of the same angle, plugging both on a `atan2(crs, dot)` call can give the angle on the full circle (-180~+180, instead of `acos(dot)` solution, which gives only 0~180) and also avoid the two sqrts involved in normalising the vectors.

Here's another explanation on the matter: http://johnblackburne.blogspot.com.br/2012/01/angle-between-two-vectors.html
Update Vector2.java

shouldn't have a conversion here
add failsafe display mode and isUsingFailsafeDisplay() methods for LWJGL
Pad so short rows dont look silly
add semicolon
remove isUsingFailsafeDisplay method from Graphics interface
Give option to use a more recent buildtools/api level if found
Dont run afterEclipseImport if no desktop project, resolves #2134
Merge pull request #2153 from Tom-Ski/master

Dont run afterEclipseImport if no desktop project, resolves #2134