Change the # of unicorn worker process from 2 to 1.

I, alone, visit the redmine site,
so 2 unicorn worker processes is unnecessary.
In other words, they are consuming much resources.

This commit fixes #112.
Merge branch 'id/112' into dev
Do not start two monit processes.

Disable the auto-start of the monit process,
and the upstart is now responsible for running monit process.

This commit fixes #113.
Merge branch 'id/113' into dev
Merge commit 'bc9da10d73d122747822f285bbf61426aeb57352' into HEAD