Merge pull request #4 from diogobaeder/master

Fallback to "notify-send" for virtualenv
Merge pull request #5 from diogobaeder/master

Fixing plugin configuration
PEP8 and headers
README, CHANGES updated
Replaced commands with subprocess
Add Python 3 to supported platforms
Mention py3k in ChangeLog
Added Travis support
Fixed travis URL
Let travis test on pypy
Updated requirements
Removed 3.1 from testing

Fails for some reason. Not sure if travis or me.
Updated travis badge URI
Close #6: Wrong specification of icon path
Version bump: 0.4.1
Version bump: v0.4.2
Added MANIFEST.in