Dialog can be showed or hidden with custom action
Began work on TextureAtlas support for BitmapFontLoader

-Added a field to the BitmapFontParameter
-Improved documentation a bit
Added support for BitmapFontLoader to load regions from TextureAtlases

-Not tested!
More support for loading BitmapFonts from atlases
Added a test for this PR
Added a test for proper disposal of resources
Added the resources for the BitmapFontAtlasRegionTest
Removed dependencies on the original font images

-Whoops, they shouldn't have been there in the first place
Added support for multiple recipients.
Slightly changed State API to properly support multiple recipients.
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
Made the map implementations Java 8 compliant.
NateS solution for ObjectMap and IdentityMap.
Added the Shape interface
Implemented Shape methods in Circle
Fixed missing closing bracket
Implemented Shape methods in Ellipse
Implemented Shape methods in Polygon
Implemented Shape methods in Polyline