Better catch for checking if WebKitPoint is supported.
Performance are not impacted on browser that supports this feature, but they are really impacted on browsers that don’t. IE 11, Firefox 12 and Chrome 40.0.2202.3 canary.
Merge pull request #1500 from thibaultzanini/Little-improvements-try-catch

Better catch for checking if the feature WebKitPoint is supported.