Update install.sh
Parse % from the notification and display progress

The code now attempts to parse possible X% match from the notification
header or text and set it as a custom hint "value" (int) for the
notification daemon to display as a progress bar.
Merge pull request #46 from dotdoom/master

Attempt to fix #44: Duplicated notifications
Merge pull request #47 from dotdoom/master-PercentageParser

Parse % from the notification and display progress
Merge pull request #41 from s0me-1/master

Update install.sh