AnimationBetween() parameter changed and more

AnimationBetween() parameter changed and more

 - resolve crash issue : http://suprem.sec.samsung.net/jira/browse/NUI-66 crash
 - event handler pattern changed
 - Visibility property in Actor.cs is removed
 - NUIApplication class is changed to public class, hello-test.cs is sample app
 - FlexContainer's child property in View.cs gets some comments
 - nui second minor version up (form 1.0.0 to 1.0.1)
 - some useless files are removed

Signed-off-by: dongsug.song <dongsug.song@samsung.com>
Change-Id: I6e3392f98b8397ace49252e966fdfb8ec663b1ec