Bug fix: checkbox and email type(Crome bug) not working

[chandansamanta]

As cursor-click & form-update event on hub causing problem with check and uncheck of the checkbox, so the checkbox get checked in form-update & then cursor-click will uncheck it as check box work as on & off. With radio button its working fine, As cursor-click will do the check uncheck operation so no need to do here, Hence commenting it.
Bug in Chrome, refer to bellow bug id.
https://code.google.com/p/chromium/issues/detail?id=324360

[chandansamanta]

Hi,
As I have found two bugs with sate synchronization of form field in togetherjs.

Bug 1::checkbox type input
As cursor-click & form-update event on hub causing problem with check and uncheck of the checkbox type input, so the checkbox get checked in form-update & then cursor-click will uncheck it as check box work as on & off. With radio button its working fine. Since checking is done through cursor-click
event which, hence not required to do it in form update

Bug 2::email type input
Email type input field data not synchronize due to exception in selectionStart and SelectionEnd, and these two can't be detectable for available or not , hence I have added try catch to ignore these exception when occurred for now.

Bug Details-
https://code.google.com/p/chromium/issues/detail?id=324360

For further we can follow avoid exception
http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#do-not-apply