Added Hotkey Ctrl+Enter for quick blasting

This patch fixes the issue #90, thus allowing users to quick blast
using the shortcut Ctrl+Enter while anywhere on the page. It is made
sure that a sequence value is filled up and appropriate database is
selected.

Signed-off-by: Vivek Rai <vivekraiiitkgp@gmail.com>
Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>