Fix a regression with FlxSprite's _maxFrames calculation.

The current approach assumed perfectly filled spritesheets rows. It used ceil() to adjust any floating value, which resulted in a blank column at the left of some graphics.

I've noticed that testing with a game that uses particles. Some particles had that blank column. Removing the ceil (which was Adam's original approach) fixed the problem.
Finish adding ASDoc for FlxTween class

I forgot about those TODOs...
Make frame "trimming" explicit by calling FlxU.floor().
Merge pull request #181 from Dovyski/fix-regression-with-FlxSprite-frames

Fix a regression with FlxSprite's _maxFrames calculation.
Fix wrong documentation about FlxObject#moves property.

FlxText#move defaults to true, to the docs were wrong.
Forgot to mention FlxText#moves defaults to true.
Merge pull request #180 from Dovyski/regression-fix-FlxText

Fix regression with FlxText regarding the "moves" property.
Fix `FlxGroup#maxSize`

In the old behavior it was destroying elements that it was going to
keep, and just dropping without destroing elements that it wasn't.
Revert "Add `FlxGroup::revive()`"

The following commit has been undone:
https://github.com/FlixelCommunity/flixel/pull/110

And a tiny bit of documentation has been added describing the changes.

Discussion:
 - https://github.com/FlixelCommunity/flixel/pull/185
 -
https://github.com/FlixelCommunity/flixel/issues/30#issuecomment-26753623
Merge pull request #187 from IQAndreas/revert-flxgroup-revive

Revert "Add `FlxGroup::revive()`"
Merge pull request #184 from IQAndreas/fix-flxgroup-maxsize

Fix `FlxGroup#maxSize`
Fix offset by one in STYLE_LOCKON camera mode.
Merge pull request #183 from IQAndreas/flxtween-asdoc

Finish adding ASDoc for FlxTween class
Remove two floor() calls.

Apparently they are not necessary.
Merge pull request #189 from Dovyski/fix-camera-offset-by-one

Fix offset by one in STYLE_LOCKON camera mode.
Add CHANGELOG

Lists everything added in Flixel v2.56.

For previous older changes, see the commit history:
 * <https://github.com/FlixelCommunity/flixel/commits>
Merge STYLE_TOPDOWN and STYLE_TOPDOWN_TIGHT

There was a lot of repeated code.
Rename variables in `FlxCamera#follow()` to be more descriptive
Only set `deadzone` if the camera is set to follow a target
Remove "platformer offset" from `LOCKON` style