Updating Espresso to 2.1
Update version to 'latest'
Merge pull request #760 from peteschaffner/espresso-update

Update Espresso to latest
add nocturne 2.0.0

a screen inversion tool - switch your colors to night mode.

also allows temporarily removing window shadows.
Merge pull request #761 from phinze/nocturne

add nocturne 2.0.0
Add TravisCI irc integration