delite/Selection: quick doc fix
Selection.md: a few doc fixes
The parameter of the fetch method is now the tracked collection. Removal
of the postProcessStore method, and renaming of preProcessStore into
processQueryResult.
Simplify Viewport code and remove dojo/window dependency.
Setup dependency on jQuery.
Convert CssState.js to use jQuery DOM class methods.
Convert focus.js to use jQuery class methods.
Convert HasDropDown.js to use jQuery DOM class and manipulation methods.
Convert place.js to use jQuery DOM manipulation methods.
popup.js: use jQuery rather than dojo/dom* modules
Scrollable: use jquery methods rather than dojo/dom ones
Convert Widget.js to use jQuery class methods.