Added growlnotify notification
use '&>' to redirect stdout and stderr
From the bash manual:
There are two formats for redirecting standard output and standard error:
  &>word
and
  >&word
Of the two forms, the first is preferred. This is semantically equivalent to
  word 2>&1
check if growlnotify or terminal-notifier is installed
removed unnecessary brackets
update dependencies in readme
clean up readme
use screencapture -i to allow switching between window and selection mode
add 'Contribute' to readme
version 1.4.4