[TIMOB-13301] Add animation to scrollToView, moveNext, movePrevious on ScrollableView

[jira-ticket](http://jira.appcelerator.org/browse/TC-1352)

* added moveNext and movePrevious on ios
* setCurrentPage is now NOT animated to follow ios behavior (and documented)
* added optional argument to moveNext, movePrevious and scrollToView. It s a boolean for animated
* fix an out of bound error on android 

#YET TO DO
I am having 2 issues on the android version for which i need help
* for the option boolean argument of moveNext, movePrevious and scrollToView. The default value is set to false, how can i set it to true? couldnt find it
* The doc says that removeView and scrollToView should accept an integer or a view. I couldnt find how to setup the kroll method on android to do so. I already prepared the backend. i only need to update the kroll methods.

thanks