created Layouting Demo and Sourcecode page
When adding a Submorph to a clipped Morph with Horizontal Layout, the clipped Morph will not extend in any direction where its clip Mode is hidden, auto or scroll.
refactored HorizontalLayout
refactored layouting functions of lively.morphic.Morph
getLayoutableSubmorphs returned an Array that contained undefined for each non resizing submorph
removed old basicLayout function from HorizontalLayout
moved functionality from Horizontal/VerlicalLayout to Layout class. Also, when resizing a container that contains flexible morphs exceeding their minimumSpace, the average space for other flexible morphs will be re-calculated now.
moved functionality from Layout instances to lively.morphic.Layout Object
submorphs of layouting morphs that have a layout and a hidden clip mode will now keep resizing when hiding parts of their content.
added tests for layouting
added flag that allows automatic resizing of continaer morph with Horizontal/Vertical Layout when submorphs are being resized (setHandleSubmorpResized)
integrated centered layouting from master
refactored VerticalScrollerLayout
fixing #setExtentAnimated, $setOpacityAnimated
when container handles submorphs resized and has a hidden clip mode it will not resize itself when a submorph resizes
do not use scroll offset in setPositionTopLeft
Merge pull request #110 from LivelyKernel/Layouting

Better layouting support for scroll containers