Fix offset by one in STYLE_LOCKON camera mode.

[Dovyski]

This pull request fixes the offset by one in STYLE_LOCKON camera mode by replacing ceil() with floor() for the targetX and targetY adjustmentns. As pointed out here, the use of floor() fixes the problem. This change does not interfere with the camera jittering fix, which remains in place and working.

[WingEraser]

Lol, I just tested master and we forgot this. Run Mode and see for yourself.
FlxCamera::follow()

deadzone = new FlxRect((width-w)/2,(height-h)/2 - h * 0.25,w,h);

deadzone = new FlxRect((width-w)/2,(height-h)/2,w,h);

[IQAndreas]

Lol, I just tested master and we forgot this.

http://www.youtube.com/watch?v=WWaLxFIVX1s

Well, I did some digging and found out why that extra bit was added. It seems like the offending commit that was supposed to fix problems with jittering also included changes which fixed a few minor unrelated things in FlxCamera (one of which didn't actually need fixing).

The (hopefully) final pull request can be found at #191, after which I will undo the merge and re-merge with the final changes (I would hate to have ugly commit history in there).

[IQAndreas]

Lol, I just tested master and we forgot this.

Final camera bug fixed in 064b978

(I was going to close this issue as well, but turns out it's already closed)