Prepare release 1.6

Release 1.5

Merge pull request cdemoulins#17 from alhirzel/master

Add "--get-volume-human" option

Catch std:exception to print a proper message (fix issue cdemoulins#10).

Archlinux User Repository use now a git repository for PKGBUILDs

Fix gamma correction with gamma==1

Prepare version 1.2

ignore some files

Change the pulseaudio dependency to libpulse.