Merge pull request #84 from mkoppanen/master

A bit of general maintenance, mainly related to issue #69
Merge pull request #85 from mkoppanen/master

Revert PR 84 for now, finding cleaner solution that supports also older libmemcached
Merge pull request #86 from mkoppanen/master

Fixed broken tests, fixed build against different libmemcached versions ...
Merge pull request #87 from mkoppanen/master

Push to start travis ci
I guess holidays 2013 makes more sense, also added travis build status