Install a newer Gearman (v1.0.6) from a PPA repository instead of using an Ubuntu-provided Gearman (0.27 in Ubuntu 12.04) which is too old and buggy
In the gearmand wrapper script, test if Gearman is up-to-date
Fix typo (and also make "update_gearman" branch recompile dependencies on Travis)
Merge branch 'update_gearman'