Merge remote-tracking branch 'alessandro40/master'
Add release 3.1.0 description in ChangeLog
Add date to the ChangeLog for v3.1.0
Add missing empty lines between each release
Fixes on ChangeLog

Requested and with the help by @bassosimone
Merge pull request #11 from alessandro40/preparing-v3.1-20140529

ChangeLog for release 3.1.0 of LibNeubot