Added scroll event handler to transactions table

Vaadin table does not support scrolling by default, what was added in
this commit is a scrolling support to Vaadin's Table (For more info:
http://ashajjar85.wordpress.com/2014/02/15/how-to-implement-scroll-listener-in-vaadin-7-tables/)
Revert "Added scroll event handler to transactions table"

This reverts commit a05a95a3a23bcfebec36dcbf6ba8f3ebbe1793a9.