Bug 802546 - Prettify the Stackframes UI, r=rcampbell

--HG--
rename : browser/devtools/shared/VariablesView.jsm => browser/devtools/shared/widgets/VariablesView.jsm
Bug 812083 - Implement a SideMenuWidget (add a tree view to the remote debugger's script selector), r=past,rcampbell

--HG--
rename : browser/devtools/debugger/test/browser_dbg_script-switching.js => browser/devtools/debugger/test/browser_dbg_scripts-switching.js
Bug 828983 - Variable View twisties on Linux are cut on the top, r=msucan