Undo phaserjs#5212 as it breaks all imports in webpack

Author: photonstorm

src/phaser-arcade-physics.js

@@ -69,6 +69,8 @@ if (typeof FEATURE_SOUND)
 
 module.exports = Phaser;
 
+global.Phaser = Phaser;
+
 /*
  * "Documentation is like pizza: when it is good, it is very, very good;
  * and when it is bad, it is better than nothing."

src/phaser-core.js

@@ -114,6 +114,8 @@ if (typeof FEATURE_SOUND)
 
 module.exports = Phaser;
 
+global.Phaser = Phaser;
+
 /*
  * "Documentation is like pizza: when it is good, it is very, very good;
  * and when it is bad, it is better than nothing."

src/phaser.js

@@ -85,6 +85,8 @@ Phaser = Extend(false, Phaser, CONST);
 
 module.exports = Phaser;
 
+global.Phaser = Phaser;
+
 /*
  * "Documentation is like pizza: when it is good, it is very, very good;
  * and when it is bad, it is better than nothing."