Set open file limit in init scripts

/etc/security/limits.conf is hit-or-miss for me. Forcing the ulimit
in the init script seems to be the most consistent way to get this
to work.

Can be overridden in /etc/sysconfig or /etc/defaults for each process.

Closes #3
Merge pull request #5 from DavidWittman/3-open-file-limit

Set open file limit in init scripts