Added a div layer to hold horizontal scrollbar, and auto'ed the bar.

CHANGED: DynaTable.js
-- Added config option for name for shell wrapper.
-- Added div to hold whole table, with auto x-axis scrollbar.
-- Changed Outer div to remove scrollbar.
-- Reduced size of Outer div to drop compensation for scrollbar.
-- Now returning the Shell div.
-- Amended rebuild routine to use shell div, not outer.
Merge pull request #18 from Hiblet/HorizontalScrollbar

Added a div layer to hold horizontal scrollbar, and auto'ed the bar.