WIP : Cell Editor Demo is added
Build file is updated , will track the root namespace "pear"
req.js is updated to have all the namespace which are independent,
  this will smooth the build process
  all non dependent namespaces are removed from grid.js

Plugins
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FilterMenu Plugin - Fixed , event propagation on menu click event
Pager Plugin - Fixed , Dropdown change Text handling , added
  parseInt base 10

UI
---
Cell & GridCell & GridFooterCell & GridHeaderCell
  Most API for Size(width & Height) and Postion ( Top & left) is deprecated
    now this is handled as CSS Class Attribute at root grid element
  GridHeaderCell - SortIndicators are created as a part of header cells
    At some point this SortIndicators should be created as a part of
    GridHeaderCellRenderer (TODO)

CellRender
  Override the setAllowTextSelection , AllowTextSelection is
    now handled at CSS style class
  Now each cell wil contain a Element (cell content element)
    to hold the content of cell
Row & GridRow
  Reference to Size & Location code is removed
Grid
  Add a new config setting - showCellBorder
  Removed most code of related to Size & Position , now this is done
    thru CSS style
  Refactored DispatchEvent methods
  MouseTracking is removed - hence mouseover row highlight feature
    is removed temporarily
  Added a new element with tabIndex =0  as child to grid DOM - this item
    will retain focus for key events
  Added a new Method to return Viewport Top Row Index
  Row Selection - Fixed , will dispatch Unselect Event on every unselect
  Highlight Row & Cell references are now maintained at Grid Level
UnitTest
  Broken Tests are updated for Width, Height , Sort and Resize