Use bash instead of dash

[maweki]

I discussed this in #7 and I find it really annoying. /bin/bash is symlinked to /bin/dash on Ubuntu and every other system that doesn't use bash but something compatible. So for the Ubuntu (and every fork, variant, spin, etc.) user it doesn't make a difference. For every user that doesn't use this particular brand of bash-compatible shell (so basically everyone in not-Ubuntu-world) has problems using this script.

Just use /bin/bash like every other shell script :)

[cosmos72]

Thanks for reminding me :)