Add automatic row-height feature

[ankushkushwaha]

I really appreciate this code. I like this approach to make cells expendable.

It is not an urgent issue but a suggestion. As of now, this code supports fixed heights i.e 44.0 (for normal cells) and 50.0 (for header cells), if this project can be modified a little so that it can also allow auto-resizing of the cells by using auto-layout, that would be very helpful for the other developers who want to use this as a base in their projects.