Update Nimrod to 0.10.0
Compile Nawak and Jester with nim instead of nimrod
Fix dependencies order for jester and nawak
Nawak: limit number of workers for Travis

The number of postgresql connections available are currently limited with Travis.
Avoids hitting the "remaining connection slots are reserved for
non-replication superuser connections" error.
Nawak: fix number of workers in the command line
Document Nimrod commits and fix 'already installed' condition
Merge pull request #1175 from idlewan/nimrod_0.10.0

Update Nimrod to 0.10.0