Fixed issue with Sencha 2.3.

Merge pull request #68 from allada/master

group variable should be private in getModel

listPosition should be private in moveContainer

offset variable not private in isOpened

Made a few variables private in createContainer

groups variable not used in addItems

style variable in createContainerCSS was public made private

layout variable in createSlideButton was public changed to private

node variable in onContainerDragstart was not private

Missing comma forcing variables into global scope

Merge pull request #57 from maarekj/master

Merge pull request #61 from chrigu-ebert/master

remove console.log

FIX BUG #56