WPF ZoomIn/Out Functionality

Added GetZoomLevel and SetZoomLevel methods to ManagedCefBrowserAdapater
Currently unable to get GetZoomLevel to return any value other than 0,
comment in source says "This method can only be called on the UI
thread", so need to investigate that further. SetZoomLevel works as
expected.
Added WPF Commands for ZoomIn, ZoomOut and ZoomReset.
Added Dependency properties for ZoomLevel and ZoomLevelIncrement
Added content menu items for ZoomIn, ZoomOut and ZoomReset to Wpf
Example
fixed binding
fixed initialization timing issue
Quick fix for WinForms WebView being broken

At the least navigate to a page on startup. Still all navigation buttons are broken like already recorded in #241 and what it points to.
README.md linkified to celebrate we have C++ < C# 

According to the GitHub language stats bar (the colored banner above the code at https://GitHub.com/cefsharp/CefSharp) we recently tipped the scales into being a C# project.
README.md now mentions MinimalExample
Update README.md

Nits and a broken link, gaah...
Set the stage to pack and push 31.0.0-pre1 CefSharp NuGet for #137

- Bump version series from 3.<something> to the new 31.0.0-pre1. Note with this we don't even have a clash with unofficial version id's pushed to staging.nuget.org :-)
- Change `cef.redist` dependency version indicator to allow auto-update or install of latest & greatest in the 3.1650.1562 series
Let's add a <licenseUrl> to packages
Cefsharp.Common.targets: cleanup and don't hijack AfterBuild
Update WebView.cs

Duh
Fix Indentation

Fix indentation from previous commit (change from tabs to spaces)
Remove commented out code
Remove call to Cef.Initialize() in OnZoomLevelChanged
Added Cut method to ManagedCefBrowserAdapter
Added shortcut to CefSharp.Wpf.WebView (also changed from if else branch to switch)
Add modifiers param to SendKeyEvent
Sent through key modifier so things like Shift-LeftArrow as expected
Also include Home key in list that gets sent to the browser directly
Add Reload(bool ignoreCache) method overload allowing for force Reload of web pages
Merge pull request #320 from amaitland/feature/add-ctrl-x-cut-support

Added Ctrl-X Cut support
Merge pull request #321 from amaitland/bug/key-modifier-not-being-sent

Key Modifier not being sent to Browser
Merge pull request #312 from jornh/master

WinForms WebView, should at least display a page on init
Merge pull request #306 from amaitland/master

WPF ZoomIn/Out Functionality