Added Transform objects to love.math (resolves issue #1228).

- Added love.math.newTransform.
- Added love.graphics.applyTransform and love.graphics.replaceTransform.
- love.graphics.draw/print/printf, Text:add/addf, and SpriteBatch:add can accept a Transform argument.
- love.graphics.push can accept an optional Transform as a second argument, which will apply the Transform after pushing the matrix stack,
- Shader:send can accept Transform objects when sending to a mat4 uniform variable.

--HG--
branch : minor

src/modules/math/MathModule.cpp

@@ -25,6 +25,7 @@
 #include "common/int.h"
 #include "common/StringMap.h"
 #include "BezierCurve.h"
+#include "Transform.h"
 
 // STL
 #include <cmath>
@@ -374,6 +375,16 @@ BezierCurve *Math::newBezierCurve(const std::vector<Vector> &points)
 	return new BezierCurve(points);
 }
 
+Transform *Math::newTransform()
+{
+	return new Transform();
+}
+
+Transform *Math::newTransform(float x, float y, float a, float sx, float sy, float ox, float oy, float kx, float ky)
+{
+	return new Transform(x, y, a, sx, sy, ox, oy, kx, ky);
+}
+
 std::string hash(HashFunction::Function function, Data *input)
 {
 	return hash(function, (const char*) input->getData(), input->getSize());