Add in ack-grep as useful tool
add in vim in useful packages
Update slow query log config

MySQL changed the format at some point and percona doesn't support
the old one.
Install required packages for turbo-hipster dbci

Helps avoid compiling issues with pip dependencies. Taken from
turbo-hipster/tools/setup_software.sh
Add th_user to sudo group

As a temporary work around until we get command specific sudo's
Merge pull request #9 from jhesketh/master

Updates