CView checks if it's still in the DOM in initHTML.
PieChart checks if it's still int the DOM to avoid throwing exceptions.
CSSImageBooleanView checks if it's been removed from the DOM to avoid throwing exceptions.
Added 'autoSetData' property to ChoiceView.
QuickBug: Bookmarks now no longer select the first bookmark on startup.
Merge branch 'master' of https://www.github.com/foam-framework/foam