pimd v2.3.1

Bug fix release.

Changes

• Let build system handle missing libite GIT submodule
• Issue #61: Debian packaging moved to https://github.com/bobek/pkg-pimd

Bug Fixes

• Issue #53: Build problem with Clang on FreeBSD
• Issue #55: Default config uses /etcpimd.conf instead of /etc/pimd.conf. Slashes added and now pimd -h lists
  the default path instead of a hard coded string.
• Issue #60: Fix minor spelling errors.