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>
Fixed erroenous blast method names

The click target event was returning incomplete string causing incorrect
blast method names to be appended in the dropdown list. This fix
is based upon the suggestion #2 by @yeban.

Closes off #119.

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