[TypeCoerce] Resolved overflowed integer issue.

- Defined maximum integer and bit
- Added function to judge integer overflowed
[Framework] Changed to respond 'DOMNodeInserted' event rather than 'beforeload'.

* [TIZEN-JIRA] TIVI-3088
Merge pull request #390 from wcwang/ivi

Resolved overflowed integer and 'beforeload' event issues