Allow rails above 3
Removing outer quotes before checking size

Multiline column default extraction bug fixed in Rails 4
https://github.com/rails/rails/commit/3e8ab910ce636c9980d4fd9bc9aade795fd578ef
Before column defaults for multiline values were wrapped in quotes, therefore
different behaviour between Rails3 and Rails4
Removing Rails3 and Rails4 differences
Rails4 does not have not null default for timestamps. Enforcing these for test
Merge pull request #11 from vanyak/rails4

Make annotator Rails4 compatible