Patching back into 2.0.4 master release a couple of important updates.
Tilemap.getTile and getTileXY used to return `null` in 2.0.3 but returned a Tile object in 2.0.4 (with an index of -1), they now return `null` again.
ScaleManager seeds _check private var with null to avoid later comparison check (thanks @jflowers45, fix #782)
P2.Body.applyForce should have used pxmi instead of pxm (thanks @Trufi, fix #776)
P2 fixed creation of RevoluteConstraint by passing maxForce in the options (thanks @woutercommandeur, fix #783)
Merge pull request #783 from woutercommandeur/dev

fix creation of RevoluteConstraint by passing maxForce in the options
readme update.
P2 fixed creation of RevoluteConstraint by passing maxForce in the options (thanks @woutercommandeur, fix #783)
Phaser 2.0.4 zero hour update.
Merge branch 'origin/master'
2.0.5-dev build release.