SymbolDisplay Initial implementation
WinStore/WinPhone SymbolDisplay: Subscribe to DpiChanged events
Added DefaultHeight and DefaultWidth properties.
Declare temporarily Symbol as object (workaround to Symbol not bindable)
WinPhone: Don't subscribe to DpiChanged event (useless)
WinStore: Use Loaded/Unloaded events to subscribe to DpiChanged event
Merge remote-tracking branch 'origin/master' into dom/issue57_SymbolDisplay
Moved SymbolDisplay to Primitives namespace.
Removed use of ThottleTimer.
Removes previous temporary workaround to API issue.
Get rid of the ArrangeOverride by setting MaxHeight/MaxWidth instead of Height/Width
Changed namespace from Esri.ArcGISRuntime.Toolkit.Primitives to Esri.ArcGISRuntime.Toolkit.Controls.Primitives for consistency with LegendItemViewModel namespace.
Merge branch 'v.next' into dom/issue57_SymbolDisplay
Remove dependency properties SwatchDpi, DefaultWidth and DefaultHeight
Merge branch 'v.next' into dom/issue57_SymbolDisplay
Merge pull request #78 from Esri/dom/issue57_SymbolDisplay

SymbolDisplay control
Merge branch 'v.next'