Merge pull request #404 from Gama11/dev_log

Fix null error bug with logging functions
Use .xml instead of .nmml
Merge pull request #405 from Gama11/dev_xml

Use .xml instead of .nmml
need to change extension of "include" file also
Merge branch 'dev' of https://github.com/HaxeFlixel/engine into dev
facing fix for FlxSprite with TextureAtlas
mouse fix for state
Fix for reflection again (it's my fault)
FlxTrail improvements from Andrei Regiani
FlxSlider refactor
Reflect.hasField() always returns false on windows target
Merge pull request #407 from Gama11/dev_FlxSlider

FlxSlider refactor
FlxSlider fixes

Now it works with properties and handle positions correctly when
minValue != 0
added one more check and removed unnecessary error msg
Fixed error msg for FlxSlider (sorry)
Reflection fix again :(
Fixed FlxTextField.setFormat() to load font correctly

by dynax. see issue #409
task manager fixes.

Thanks @Henry.T
blocked sounds for html5 target

(until i'll make them work there)
Fix FlxU.formatTime to correctly display milliseconds

FlxU.formatTime takes Seconds as an Int, but should take a Float to allow for the option of displaying milliseconds (ShowMS).